diff --git a/.claude/skills/js-bundling/SKILL.md b/.claude/skills/js-bundling/SKILL.md
index 07e195e6..9ff7d82a 100644
--- a/.claude/skills/js-bundling/SKILL.md
+++ b/.claude/skills/js-bundling/SKILL.md
@@ -90,7 +90,6 @@ Current third-party libraries:
 | @sgratzl/chartjs-chart-boxplot | Box plot chart type |
 | chartjs-chart-matrix | Matrix/heatmap chart type |
 | GridStack | Drag-and-drop dashboard layout |
-| Pako | `pako.inflate()` — decompress embedded data in the browser |
 | Bootstrap | Modals, layout, admin page UI |
 | DataTables (3.x, no jQuery) | Tables page, admin page tables |
 
@@ -128,8 +127,8 @@ json.dumps(data).encode("utf-8")  # serialize
 **JavaScript (browser):**
 ```javascript
 // js/variables/data.js
-const runs = decode_and_decompress("placeholder_runs");
-// atob() → Uint8Array → pako.inflate() → JSON.parse()
+await load_data();   // main() awaits this before anything reads runs/suites/tests/...
+// atob() → Uint8Array → native DecompressionStream("deflate") → Response.json()
 ```
 
-Pako (the JS zlib port) is the only dependency required to decode data, so it must always be loaded before `data.js` runs.
+Decoding needs no library: the browser's `DecompressionStream` inflates the zlib payload. It is async, so the data arrays are empty `let` bindings until `load_data()` resolves — never read them at module load time, only from code that runs after `main()` awaited it.
diff --git a/docs/advanced-cli-examples.md b/docs/advanced-cli-examples.md
index 5a1e9dba..2229a687 100644
--- a/docs/advanced-cli-examples.md
+++ b/docs/advanced-cli-examples.md
@@ -209,7 +209,6 @@ The following dependencies are bundled with the package and will be used offline
 | **datatables_css** | CSS | https://cdn.datatables.net/v/bs5/dt-3.0.4/datatables.min.css | Table component styling |
 | **bootstrap_js** | JS | https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/5.3.8/js/bootstrap.bundle.min.js | Bootstrap interactive components |
 | **datatables_js** | JS | https://cdn.datatables.net/v/bs5/dt-3.0.4/datatables.min.js | DataTables functionality |
-| **pako** | JS | https://cdn.jsdelivr.net/npm/pako@3.0.2/dist/browser/pako_inflate.umd.min.js | Compression/decompression used for smaller dashboard file sizes |
 
 ### Behaviour
 
diff --git a/robotframework_dashboard/dependencies.py b/robotframework_dashboard/dependencies.py
index 78e69c54..33674502 100644
--- a/robotframework_dashboard/dependencies.py
+++ b/robotframework_dashboard/dependencies.py
@@ -73,12 +73,6 @@
         "local": "dependencies/datatables.js",
         "admin_page": True,
     },
-    "pako": {
-        "type": "js",
-        "cdn": "https://cdn.jsdelivr.net/npm/pako@3.0.2/dist/browser/pako_inflate.umd.min.js",
-        "local": "dependencies/pako.js",
-        "admin_page": False,
-    },
 }
 
 
diff --git a/robotframework_dashboard/dependencies/pako.js b/robotframework_dashboard/dependencies/pako.js
deleted file mode 100644
index 59f75756..00000000
--- a/robotframework_dashboard/dependencies/pako.js
+++ /dev/null
@@ -1,2 +0,0 @@
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s-=e.strm.avail_in,s&&(s>=e.w_size?(e.matches=2,e.window.set(e.strm.input.subarray(e.strm.next_in-e.w_size,e.strm.next_in),0),e.strstart=e.w_size,e.insert=e.strstart):(e.window_size-e.strstart<=s&&(e.strstart-=e.w_size,e.window.set(e.window.subarray(e.w_size,e.w_size+e.strstart),0),e.matches<2&&e.matches++,e.insert>e.strstart&&(e.insert=e.strstart)),e.window.set(e.strm.input.subarray(e.strm.next_in-s,e.strm.next_in),e.strstart),e.strstart+=s,e.insert+=s>e.w_size-e.insert?e.w_size-e.insert:s),e.block_start=e.strstart),e.high_water<e.strstart&&(e.high_water=e.strstart),o?Se:t!==0&&t!==4&&e.strm.avail_in===0&&e.strstart===e.block_start?be:(a=e.window_size-e.strstart,e.strm.avail_in>a&&e.block_start>=e.w_size&&(e.block_start-=e.w_size,e.strstart-=e.w_size,e.window.set(e.window.subarray(e.w_size,e.w_size+e.strstart),0),e.matches<2&&e.matches++,a+=e.w_size,e.insert>e.strstart&&(e.insert=e.strstart)),a>e.strm.avail_in&&(a=e.strm.avail_in),a&&(Ee(e.strm,e.window,e.strstart,a),e.strstart+=a,e.insert+=a>e.w_size-e.insert?e.w_size-e.insert:a),e.high_water<e.strstart&&(e.high_water=e.strstart),a=e.bi_valid+42>>3,a=e.pending_buf_size-a>65535?65535:e.pending_buf_size-a,n=a>e.w_size?e.w_size:a,i=e.strstart-e.block_start,(i>=n||(i||t===4)&&t!==0&&e.strm.avail_in===0&&i<=a)&&(r=i>a?a:i,o=+(t===4&&e.strm.avail_in===0&&r===i),me(e,e.block_start,r,o),e.block_start+=r,Te(e.strm)),o?xe:z)},Ae=(e,t)=>{let n,r;for(;;){if(e.lookahead<R){if(Oe(e),e.lookahead<R&&t===0)return z;if(e.lookahead===0)break}if(n=0,e.lookahead>=L&&(n=B(e,e.strstart)),n!==0&&e.strstart-n<=e.w_size-R&&(e.match_length=De(e,n)),e.match_length>=L)if(r=F(e,e.strstart-e.match_start,e.match_length-L),e.lookahead-=e.match_length,e.match_length<=e.max_lazy_match&&e.lookahead>=L){e.match_length--;do e.strstart++,n=B(e,e.strstart);while(--e.match_length!==0);e.strstart++}else e.strstart+=e.match_length,e.match_length=0,e.legacy_hash&&(e.ins_h=e.window[e.strstart],e.ins_h=we(e,e.ins_h,e.window[e.strstart+1]));else r=F(e,0,e.window[e.strstart]),e.lookahead--,e.strstart++;if(r&&(V(e,!1),e.strm.avail_out===0))return z}return e.insert=e.strstart<L-1?e.strstart:L-1,t===4?(V(e,!0),e.strm.avail_out===0?xe:Se):e.sym_next&&(V(e,!1),e.strm.avail_out===0)?z:be},H=(e,t)=>{let n,r,i;for(;;){if(e.lookahead<R){if(Oe(e),e.lookahead<R&&t===0)return z;if(e.lookahead===0)break}if(n=0,e.lookahead>=L&&(n=B(e,e.strstart)),e.prev_length=e.match_length,e.prev_match=e.match_start,e.match_length=L-1,n!==0&&e.prev_length<e.max_lazy_match&&e.strstart-n<=e.w_size-R&&(e.match_length=De(e,n),e.match_length<=5&&(e.strategy===1||e.match_length===L&&e.strstart-e.match_start>4096)&&(e.match_length=L-1)),e.prev_length>=L&&e.match_length<=e.prev_length){i=e.strstart+e.lookahead-L,r=F(e,e.strstart-1-e.prev_match,e.prev_length-L),e.lookahead-=e.prev_length-1,e.prev_length-=2;do++e.strstart<=i&&(n=B(e,e.strstart));while(--e.prev_length!==0);if(e.match_available=0,e.match_length=L-1,e.strstart++,r&&(V(e,!1),e.strm.avail_out===0))return z}else if(e.match_available){if(r=F(e,0,e.window[e.strstart-1]),r&&V(e,!1),e.strstart++,e.lookahead--,e.strm.avail_out===0)return z}else e.match_available=1,e.strstart++,e.lookahead--}return e.match_available&&(r=F(e,0,e.window[e.strstart-1]),e.match_available=0),e.insert=e.strstart<L-1?e.strstart:L-1,t===4?(V(e,!0),e.strm.avail_out===0?xe:Se):e.sym_next&&(V(e,!1),e.strm.avail_out===0)?z:be},U=class{constructor(e,t,n,r,i){this.good_length=e,this.max_lazy=t,this.nice_length=n,this.max_chain=r,this.func=i}};new U(0,0,0,0,ke),new U(4,4,8,4,Ae),new U(4,5,16,8,Ae),new U(4,6,32,32,Ae),new U(4,4,16,16,H),new U(8,16,32,32,H),new U(8,16,128,128,H),new U(8,32,128,256,H),new U(32,128,258,1024,H),new U(32,258,258,4096,H);var W=16209,je=16191;function Me(e,t){let n,r,i,a,o,s,c,l,u,d,f,p,m,h,g,_,v,y,b,x,S,C,w,T,E=e.state;n=e.next_in,w=e.input,r=n+(e.avail_in-5),i=e.next_out,T=e.output,a=i-(t-e.avail_out),o=i+(e.avail_out-257),s=E.dmax,c=E.wsize,l=E.whave,u=E.wnext,d=E.window,f=E.hold,p=E.bits,m=E.lencode,h=E.distcode,g=(1<<E.lenbits)-1,_=(1<<E.distbits)-1;top:do{p<15&&(f+=w[n++]<<p,p+=8,f+=w[n++]<<p,p+=8),v=m[f&g];dolen:for(;;){if(y=v>>>24,f>>>=y,p-=y,y=v>>>16&255,y===0)T[i++]=v&65535;else if(y&16){b=v&65535,y&=15,y&&(p<y&&(f+=w[n++]<<p,p+=8),b+=f&(1<<y)-1,f>>>=y,p-=y),p<15&&(f+=w[n++]<<p,p+=8,f+=w[n++]<<p,p+=8),v=h[f&_];dodist:for(;;){if(y=v>>>24,f>>>=y,p-=y,y=v>>>16&255,y&16){if(x=v&65535,y&=15,p<y&&(f+=w[n++]<<p,p+=8,p<y&&(f+=w[n++]<<p,p+=8)),x+=f&(1<<y)-1,x>s){e.msg=`invalid distance too far back`,E.mode=W;break top}if(f>>>=y,p-=y,y=i-a,x>y){if(y=x-y,y>l&&E.sane){e.msg=`invalid distance too far back`,E.mode=W;break top}if(S=0,C=d,u===0){if(S+=c-y,y<b){b-=y;do T[i++]=d[S++];while(--y);S=i-x,C=T}}else if(u<y){if(S+=c+u-y,y-=u,y<b){b-=y;do T[i++]=d[S++];while(--y);if(S=0,u<b){y=u,b-=y;do T[i++]=d[S++];while(--y);S=i-x,C=T}}}else if(S+=u-y,y<b){b-=y;do T[i++]=d[S++];while(--y);S=i-x,C=T}for(;b>2;)T[i++]=C[S++],T[i++]=C[S++],T[i++]=C[S++],b-=3;b&&(T[i++]=C[S++],b>1&&(T[i++]=C[S++]))}else{S=i-x;do T[i++]=T[S++],T[i++]=T[S++],T[i++]=T[S++],b-=3;while(b>2);b&&(T[i++]=T[S++],b>1&&(T[i++]=T[S++]))}}else if(y&64){e.msg=`invalid distance code`,E.mode=W;break top}else{v=h[(v&65535)+(f&(1<<y)-1)];continue dodist}break}}else if(!(y&64)){v=m[(v&65535)+(f&(1<<y)-1)];continue dolen}else if(y&32){E.mode=je;break top}else{e.msg=`invalid literal/length code`,E.mode=W;break top}break}}while(n<r&&i<o);b=p>>3,n-=b,p-=b<<3,f&=(1<<p)-1,e.next_in=n,e.next_out=i,e.avail_in=n<r?5+(r-n):5-(n-r),e.avail_out=i<o?257+(o-i):257-(i-o),E.hold=f,E.bits=p}var G=15,Ne=852,Pe=592,Fe=0,Ie=1,Le=2,Re=new Uint16Array([3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0]),ze=new Uint8Array([16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,199,75]),Be=new Uint16Array([1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0]),Ve=new Uint8Array([16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64]),K=(e,t,n,r,i,a,o,s)=>{let c=s.bits,l=0,u=0,d=0,f=0,p=0,m=0,h=0,g=0,_=0,v=0,y,b,x,S,C,w=null,T,E=new Uint16Array(16),D=new Uint16Array(16),O=null,k,A,j;for(l=0;l<=G;l++)E[l]=0;for(u=0;u<r;u++)E[t[n+u]]++;for(p=c,f=G;f>=1&&E[f]===0;f--);if(p>f&&(p=f),f===0)return 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v!==0&&(i[C+v]=l-h<<24|4194304),s.bits=p,0},He=0,Ue=1,We=2,q=16180,Ge=16181,Ke=16182,qe=16183,Je=16184,Ye=16185,Xe=16186,Ze=16187,Qe=16188,$e=16189,J=16190,Y=16191,et=16192,tt=16193,nt=16194,rt=16195,it=16196,at=16197,ot=16198,st=16199,ct=16200,lt=16201,ut=16202,dt=16203,ft=16204,pt=16205,mt=16206,ht=16207,gt=16208,X=16209,_t=16210,vt=16211,yt=852,bt=592,xt=e=>(e>>>24&255)+(e>>>8&65280)+((e&65280)<<8)+((e&255)<<24),St=class{constructor(){this.strm=null,this.mode=0,this.last=!1,this.wrap=0,this.havedict=!1,this.flags=0,this.dmax=0,this.check=0,this.total=0,this.head=null,this.wbits=0,this.wsize=0,this.whave=0,this.wnext=0,this.window=null,this.hold=0,this.bits=0,this.length=0,this.offset=0,this.extra=0,this.lencode=null,this.distcode=null,this.lenbits=0,this.distbits=0,this.ncode=0,this.nlen=0,this.ndist=0,this.have=0,this.next=null,this.lens=new Uint16Array(320),this.work=new Uint16Array(288),this.lendyn=null,this.distdyn=null,this.sane=0,this.back=0,this.was=0}},Z=e=>{if(!e)return 1;let t=e.state;return+(!t||t.strm!==e||t.mode<q||t.mode>vt)},Ct=e=>{if(Z(e))return-2;let t=e.state;return e.total_in=e.total_out=t.total=0,e.msg=``,t.wrap&&(e.adler=t.wrap&1),t.mode=q,t.last=0,t.havedict=0,t.flags=-1,t.dmax=32768,t.head=null,t.hold=0,t.bits=0,t.lencode=t.lendyn=new Int32Array(yt),t.distcode=t.distdyn=new Int32Array(bt),t.sane=1,t.back=-1,0},wt=e=>{if(Z(e))return-2;let t=e.state;return t.wsize=0,t.whave=0,t.wnext=0,Ct(e)},Tt=(e,t)=>{let n;if(Z(e))return-2;let r=e.state;return t<0?(n=0,t=-t):(n=(t>>4)+5,t<48&&(t&=15)),t&&(t<8||t>15)?-2:(r.window!==null&&r.wbits!==t&&(r.window=null),r.wrap=n,r.wbits=t,wt(e))},Et=(e,t)=>{if(!e)return-2;let n=new St;e.state=n,n.strm=e,n.window=null,n.mode=q;let r=Tt(e,t);return r!==0&&(e.state=null),r},Dt=!0,Ot,kt,At=e=>{if(Dt){Ot=new Int32Array(512),kt=new Int32Array(32);let t=0;for(;t<144;)e.lens[t++]=8;for(;t<256;)e.lens[t++]=9;for(;t<280;)e.lens[t++]=7;for(;t<288;)e.lens[t++]=8;for(K(Ue,e.lens,0,288,Ot,0,e.work,{bits:9}),t=0;t<32;)e.lens[t++]=5;K(We,e.lens,0,32,kt,0,e.work,{bits:5}),Dt=!1}e.lencode=Ot,e.lenbits=9,e.distcode=kt,e.distbits=5},jt=(e,t,n,r)=>{let i,a=e.state;return a.window===null&&(a.window=new Uint8Array(1<<a.wbits)),a.wsize===0&&(a.wsize=1<<a.wbits,a.wnext=0,a.whave=0),r>=a.wsize?(a.window.set(t.subarray(n-a.wsize,n),0),a.wnext=0,a.whave=a.wsize):(i=a.wsize-a.wnext,i>r&&(i=r),a.window.set(t.subarray(n-r,n-r+i),a.wnext),r-=i,r?(a.window.set(t.subarray(n-r,n),0),a.wnext=r,a.whave=a.wsize):(a.wnext+=i,a.wnext===a.wsize&&(a.wnext=0),a.whave<a.wsize&&(a.whave+=i))),0},Mt=(e,t)=>{let n,r,i,a,o,s,c,l,u,d,f,p,m,h,g=0,_,v,y,b,x,S,C,w,T=new Uint8Array(4),E,D,O=new Uint8Array([16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15]);if(Z(e)||!e.output||!e.input&&e.avail_in!==0)return-2;n=e.state,n.mode===Y&&(n.mode=et),o=e.next_out,i=e.output,c=e.avail_out,a=e.next_in,r=e.input,s=e.avail_in,l=n.hold,u=n.bits,d=s,f=c,w=0;inf_leave:for(;;)switch(n.mode){case q:if(n.wrap===0){n.mode=et;break}for(;u<16;){if(s===0)break inf_leave;s--,l+=r[a++]<<u,u+=8}if(n.wrap&2&&l===35615){n.wbits===0&&(n.wbits=15),n.check=0,T[0]=l&255,T[1]=l>>>8&255,n.check=I(n.check,T,2,0),l=0,u=0,n.mode=Ge;break}if(n.head&&(n.head.done=!1),!(n.wrap&1)||(((l&255)<<8)+(l>>8))%31){e.msg=`incorrect header check`,n.mode=X;break}if((l&15)!=8){e.msg=`unknown compression method`,n.mode=X;break}if(l>>>=4,u-=4,C=(l&15)+8,n.wbits===0&&(n.wbits=C),C>15||C>n.wbits){e.msg=`invalid window size`,n.mode=X;break}n.dmax=1<<n.wbits,n.flags=0,e.adler=n.check=1,n.mode=l&512?$e:Y,l=0,u=0;break;case Ge:for(;u<16;){if(s===0)break inf_leave;s--,l+=r[a++]<<u,u+=8}if(n.flags=l,(n.flags&255)!=8){e.msg=`unknown compression method`,n.mode=X;break}if(n.flags&57344){e.msg=`unknown header flags set`,n.mode=X;break}n.head&&(n.head.text=l>>8&1),n.flags&512&&n.wrap&4&&(T[0]=l&255,T[1]=l>>>8&255,n.check=I(n.check,T,2,0)),l=0,u=0,n.mode=Ke;case Ke:for(;u<32;){if(s===0)break inf_leave;s--,l+=r[a++]<<u,u+=8}n.head&&(n.head.time=l>>>0),n.flags&512&&n.wrap&4&&(T[0]=l&255,T[1]=l>>>8&255,T[2]=l>>>16&255,T[3]=l>>>24&255,n.check=I(n.check,T,4,0)),l=0,u=0,n.mode=qe;case qe:for(;u<16;){if(s===0)break inf_leave;s--,l+=r[a++]<<u,u+=8}n.head&&(n.head.xflags=l&255,n.head.os=l>>8),n.flags&512&&n.wrap&4&&(T[0]=l&255,T[1]=l>>>8&255,n.check=I(n.check,T,2,0)),l=0,u=0,n.mode=Je;case Je:if(n.flags&1024){for(;u<16;){if(s===0)break inf_leave;s--,l+=r[a++]<<u,u+=8}n.length=l,n.head&&(n.head.extra_len=l),n.flags&512&&n.wrap&4&&(T[0]=l&255,T[1]=l>>>8&255,n.check=I(n.check,T,2,0)),l=0,u=0}else n.head&&(n.head.extra=null);n.mode=Ye;case 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diff --git a/robotframework_dashboard/js/filter/availability.js b/robotframework_dashboard/js/filter/availability.js
index 69e87d35..23cc6e00 100644
--- a/robotframework_dashboard/js/filter/availability.js
+++ b/robotframework_dashboard/js/filter/availability.js
@@ -1,6 +1,5 @@
 import { settings } from '../variables/settings.js';
-import { runs, suites } from '../variables/data.js';
-import { apply_custom_filter_dimension, apply_date_filter, apply_metadata_filter, apply_project_version_filter, apply_run_name_filter, apply_runtag_filter, build_date_range, collect_custom_filter_dimensions, convert_timezone, get_custom_filter_value, get_hidden_custom_filters, get_project_version_value, remove_milliseconds, remove_timezones } from './pipeline.js';
+import { apply_custom_filter_dimension, apply_date_filter, apply_metadata_filter, apply_project_version_filter, apply_run_name_filter, apply_runtag_filter, build_date_range, collect_custom_filter_dimensions, get_custom_filter_value, get_hidden_custom_filters, get_project_version_value, get_transformed_data } from './pipeline.js';
 import { get_metadata_options } from './modal_options.js';
 import { apply_suite_path_run_filter } from './suite_path.js';
 import { capture_current_filters } from './profiles.js';
@@ -11,36 +10,6 @@ import { capture_current_filters } from './profiles.js';
 // The counts follow the usual faceted-search rule: the count of an option in filter X is
 // computed with every filter except X applied, so selecting a value in X never makes the other
 // values of X disappear. The amount filter ("last X runs") is not a category and is left out.
-let filterBaseRunsCache = { key: null, runs: null, suites: null };
-
-// key of the settings that change run_start representation, and with it which runs a date
-// range matches and which suites belong to which run
-function get_filter_base_cache_key() {
-    return `${settings.show.milliseconds}|${settings.show.convertTimezone}|${settings.show.timezones}`;
-}
-
-function apply_run_start_transformations(data) {
-    return remove_timezones(convert_timezone(remove_milliseconds(data)));
-}
-
-// all runs with the same run_start transformations the filter pipeline applies, so the
-// availability computation compares the same timestamps as the real filters do
-function get_filter_base_runs() {
-    const key = get_filter_base_cache_key();
-    if (filterBaseRunsCache.key !== key) {
-        filterBaseRunsCache = { key: key, runs: apply_run_start_transformations(runs), suites: null };
-    }
-    return filterBaseRunsCache.runs;
-}
-
-// suites are only needed while a suite path is selected, so they are transformed on demand
-function get_filter_base_suites() {
-    get_filter_base_runs();
-    if (filterBaseRunsCache.suites === null) {
-        filterBaseRunsCache.suites = apply_run_start_transformations(suites);
-    }
-    return filterBaseRunsCache.suites;
-}
 
 // turn the profile object of capture_current_filters() into the selection shape the apply_*
 // functions take
@@ -85,7 +54,7 @@ function apply_filters_except(runList, selections, facet, dimName = null, suiteL
         result = apply_date_filter(result, selections.dateRange.from, selections.dateRange.to);
     }
     if (selections.suitePath && selections.suitePath !== "All") {
-        result = apply_suite_path_run_filter(result, selections.suitePath, suiteList ?? get_filter_base_suites());
+        result = apply_suite_path_run_filter(result, selections.suitePath, suiteList ?? get_transformed_data("suites"));
     }
     return result;
 }
@@ -164,7 +133,7 @@ function compute_filter_option_availability(runList, selections, suiteList = nul
 // amount filter is left out for the same reason it is left out of the option counts.
 function get_runs_for_date_histogram() {
     const selections = normalize_filter_selections(capture_current_filters());
-    return apply_filters_except(get_filter_base_runs(), selections, "dates");
+    return apply_filters_except(get_transformed_data("runs"), selections, "dates");
 }
 
 // add or update the "(X)" count of one filter option row. The count is a sibling of the
@@ -237,7 +206,7 @@ function refresh_filter_option_availability() {
         return;
     }
     const selections = normalize_filter_selections(capture_current_filters());
-    const availability = compute_filter_option_availability(get_filter_base_runs(), selections);
+    const availability = compute_filter_option_availability(get_transformed_data("runs"), selections);
     apply_availability_to_select(document.getElementById("runs"), availability.runs);
     apply_availability_to_select(document.getElementById("metadata"), availability.metadata);
     apply_availability_to_checkbox_list(document.getElementById("runTag"), availability.runTags);
diff --git a/robotframework_dashboard/js/filter/pipeline.js b/robotframework_dashboard/js/filter/pipeline.js
index ef78ed4c..6030f657 100644
--- a/robotframework_dashboard/js/filter/pipeline.js
+++ b/robotframework_dashboard/js/filter/pipeline.js
@@ -8,11 +8,26 @@ import { filter_runs_by_suite_path, filter_suite_path_data } from './suite_path.
 // Sort an array of run objects by wall-clock run_start (timezone offset stripped),
 // ensuring correct chronological order when timestamps span mixed timezone offsets.
 function sort_wall_clock(data) {
-    return [...data].sort((a, b) => {
-        const ak = strip_tz_suffix(a.run_start);
-        const bk = strip_tz_suffix(b.run_start);
-        return ak < bk ? -1 : ak > bk ? 1 : 0;
-    });
+    return data
+        .map((item, index) => ({ item, index, key: strip_tz_suffix(item.run_start) }))
+        .sort((a, b) => a.key < b.key ? -1 : a.key > b.key ? 1 : a.index - b.index)
+        .map(entry => entry.item);
+}
+
+// the run_start transformations only depend on these settings, so they are cached per combination
+// instead of copying every row on each filter apply; the filter availability uses the same copies
+let transformedDataCache = { key: null, data: {} };
+
+function get_transformed_data(name) {
+    const key = `${settings.show.milliseconds}|${settings.show.convertTimezone}|${settings.show.timezones}`;
+    if (transformedDataCache.key !== key) {
+        transformedDataCache = { key: key, data: {} };
+    }
+    if (!(name in transformedDataCache.data)) {
+        const sourceData = { runs, suites, tests, keywords, exceptions }[name];
+        transformedDataCache.data[name] = remove_timezones(convert_timezone(remove_milliseconds(sourceData)));
+    }
+    return transformedDataCache.data[name];
 }
 
 const dashboardPages = ["overview", "dashboard", "compare", "tables"];
@@ -38,23 +53,11 @@ function apply_custom_filter_visibility() {
 // function updates the data in the graphs whenever filters are updated
 function setup_filtered_data_and_filters() {
     apply_custom_filter_visibility();
-    filteredRuns = remove_milliseconds(runs)
-    filteredSuites = remove_milliseconds(suites)
-    filteredTests = remove_milliseconds(tests)
-    filteredKeywords = remove_milliseconds(keywords)
-    filteredExceptions = remove_milliseconds(exceptions)
-    // convert timezones if enabled (must run before remove_timezones so the offset is still present)
-    filteredRuns = convert_timezone(filteredRuns);
-    filteredSuites = convert_timezone(filteredSuites);
-    filteredTests = convert_timezone(filteredTests);
-    filteredKeywords = convert_timezone(filteredKeywords);
-    filteredExceptions = convert_timezone(filteredExceptions);
-    // remove timezone display if disabled
-    filteredRuns = remove_timezones(filteredRuns);
-    filteredSuites = remove_timezones(filteredSuites);
-    filteredTests = remove_timezones(filteredTests);
-    filteredKeywords = remove_timezones(filteredKeywords);
-    filteredExceptions = remove_timezones(filteredExceptions);
+    filteredRuns = get_transformed_data("runs");
+    filteredSuites = get_transformed_data("suites");
+    filteredTests = get_transformed_data("tests");
+    filteredKeywords = get_transformed_data("keywords");
+    filteredExceptions = get_transformed_data("exceptions");
     // determine filteredRuns with all run-level filters (suite path + amount last)
     filteredRuns = filter_runs(filteredRuns);
     filteredRuns = filter_runtags(filteredRuns);
@@ -437,8 +440,8 @@ function filter_metadata(filteredRuns) {
 
 // function to filter suites/tests/keywords based on the already filtered runs
 function filter_data(data) {
-    const validRunStarts = filteredRuns.map(v => v.run_start);
-    let filteredData = data.filter(v => validRunStarts.includes(v.run_start));
+    const validRunStarts = new Set(filteredRuns.map(v => v.run_start));
+    let filteredData = data.filter(v => validRunStarts.has(v.run_start));
     if (filteredData.length > 0 && "owner" in filteredData[0]) {
         const libraries = settings.libraries || {};
         filteredData = filteredData.filter(item => {
@@ -470,8 +473,10 @@ export {
     get_hidden_custom_filters,
     get_project_version_value,
     get_run_start_date,
+    get_transformed_data,
     parse_custom_filters,
     remove_milliseconds,
     remove_timezones,
     setup_filtered_data_and_filters,
+    sort_wall_clock,
 };
diff --git a/robotframework_dashboard/js/filter/section_selects.js b/robotframework_dashboard/js/filter/section_selects.js
index cb05e182..c6b9b7a3 100644
--- a/robotframework_dashboard/js/filter/section_selects.js
+++ b/robotframework_dashboard/js/filter/section_selects.js
@@ -103,20 +103,19 @@ function setup_tests_in_select() {
     const testTagsSelect = document.getElementById("testTagsSelect").value;
     const testSelect = document.getElementById("testSelect");
     testSelect.innerHTML = "";
-    const testNames = filteredTests.reduce((names, test) => {
+    const testNames = new Set();
+    for (const test of filteredTests) {
+        if (testNames.has(test.name)) continue;
         const isInSuite = settings.switch.suitePathsTestSection
             ? test.full_name.includes(`${suiteSelectTests}.${test.name}`) || suiteSelectTests === "All"
             : test.full_name.includes(`.${suiteSelectTests}.${test.name}`) || suiteSelectTests === "All"
         const hasTag = testTagsSelect === "All" || test.tags.includes(testTagsSelect);
-
-        if (isInSuite && hasTag && !names.includes(test.name)) {
-            names.push(test.name);
+        if (isInSuite && hasTag) {
+            testNames.add(test.name);
         }
-
-        return names;
-    }, []);
+    }
     testSelect.options.add(new Option("All", "All"));
-    testNames.sort().forEach(testName => testSelect.options.add(new Option(testName, testName)));
+    [...testNames].sort().forEach(testName => testSelect.options.add(new Option(testName, testName)));
 }
 
 // function to update the available testtags to select in the filters
diff --git a/robotframework_dashboard/js/graph_creation/overview.js b/robotframework_dashboard/js/graph_creation/overview.js
index e25f957a..67a7b4ed 100644
--- a/robotframework_dashboard/js/graph_creation/overview.js
+++ b/robotframework_dashboard/js/graph_creation/overview.js
@@ -449,15 +449,13 @@ function create_project_cards_container(projectName, projectRuns, percent = null
     }
 
     const container = document.getElementById(`${projectName}RunCardsContainer`);
+    destroy_overview_donuts(container);
     container.innerHTML = '';
     const projectRunsToShow = projectRuns.slice().reverse();
-    // create cards and charts for each run card
+    // create cards and charts for each run card, create_project_run_card also creates the donut
     projectRunsToShow.forEach((run, idx) => {
         const runNumber = projectRunsToShow.length - idx;
-        const createdRunCardId = create_project_run_card(run, projectName, idx, runNumber, passRate, percent, durations, false);
-        const createdRunCard = document.getElementById(createdRunCardId);
-        container.appendChild(createdRunCard);
-        create_overview_run_donut(run, idx, projectName);
+        create_project_run_card(run, projectName, idx, runNumber, passRate, percent, durations, false);
     });
 }
 
@@ -467,6 +465,7 @@ function create_overview_latest_graphs(preFilteredRuns = null) {
     if (!orderEl) return;
     const order = orderEl.value;
     const overviewCardsContainer = document.getElementById("overviewLatestRunCardsContainer");
+    destroy_overview_donuts(overviewCardsContainer);
     overviewCardsContainer.innerHTML = '';
     const allProjects = { ...projects_by_name, ...projects_by_tag };
     const durationsByProject = {};
@@ -527,6 +526,7 @@ function create_overview_latest_graphs(preFilteredRuns = null) {
 function create_overview_total_graphs(preFilteredRuns = null) {
     const overviewCardsContainer = document.getElementById("overviewTotalRunCardsContainer");
     if (!overviewCardsContainer) return;
+    destroy_overview_donuts(overviewCardsContainer);
     overviewCardsContainer.innerHTML = '';
     const allProjects = { ...projects_by_name, ...projects_by_tag };
     const durationsByProject = {};
@@ -621,6 +621,7 @@ function create_project_run_card(run, projectName, runIndex, runNumber, passRate
     )
     const existingRunCard = document.getElementById(`${projectNameForId}Card${runIndex}`);
     if (existingRunCard) {
+        destroy_overview_donuts(existingRunCard);
         // preserves listeners of element
         existingRunCard.replaceWith(document.createRange().createContextualFragment(projectRunCardHTML));
     } else {
@@ -660,7 +661,7 @@ function create_overview_run_donut(run, chartElementPostfix, projectName) {
         );
         return;
     }
-    if (el.chartInstance) el.chartInstance.destroy();
+    destroy_overview_donut(el);
     const chartData = {
         labels: [],
         datasets: [{
@@ -684,7 +685,44 @@ function create_overview_run_donut(run, chartElementPostfix, projectName) {
     const config = get_graph_config('donut', chartData, 'Run Status');
     delete config.options.plugins.datalabels;
     config.options.plugins.legend.display = false;
-    el.chartInstance = new Chart(el, config);
+    // the run cards can hold hundreds of donuts of which only a few are on screen, so a donut
+    // is only created once its card comes near the viewport
+    el.pendingChartConfig = config;
+    get_lazy_donut_observer().observe(el);
+}
+
+let lazyDonutObserver = null;
+
+function get_lazy_donut_observer() {
+    if (!lazyDonutObserver) {
+        lazyDonutObserver = new IntersectionObserver(entries => {
+            for (const entry of entries) {
+                if (!entry.isIntersecting) continue;
+                const el = entry.target;
+                lazyDonutObserver.unobserve(el);
+                if (el.pendingChartConfig) {
+                    el.chartInstance = new Chart(el, el.pendingChartConfig);
+                    delete el.pendingChartConfig;
+                }
+            }
+        }, { rootMargin: "500px" });
+    }
+    return lazyDonutObserver;
+}
+
+function destroy_overview_donut(el) {
+    lazyDonutObserver?.unobserve(el);
+    delete el.pendingChartConfig;
+    if (el.chartInstance) {
+        el.chartInstance.destroy();
+        delete el.chartInstance;
+    }
+}
+
+// Chart.js keeps a reference to every chart until it is destroyed, so the donuts have to be
+// destroyed before their cards are removed from the page
+function destroy_overview_donuts(container) {
+    container.querySelectorAll(".overview-canvas canvas").forEach(destroy_overview_donut);
 }
 
 function update_overview_latest_heading() {
diff --git a/robotframework_dashboard/js/graph_creation/suite.js b/robotframework_dashboard/js/graph_creation/suite.js
index 00ce3fa7..313b2143 100644
--- a/robotframework_dashboard/js/graph_creation/suite.js
+++ b/robotframework_dashboard/js/graph_creation/suite.js
@@ -3,7 +3,7 @@ import { get_statistics_graph_data } from '../graph_data/statistics.js';
 import { get_duration_graph_data } from '../graph_data/duration.js';
 import { get_graph_config } from '../graph_data/graph_config.js';
 import { build_tooltip_meta, lookup_tooltip_meta, format_status } from '../graph_data/tooltip_helpers.js';
-import { exclude_from_suite_data } from '../graph_data/helpers.js';
+import { get_suite_data_exclusion } from '../graph_data/helpers.js';
 import { setup_suites_in_suite_select } from '../filter/section_selects.js';
 import { format_duration } from '../common.js';
 import { dataLabelConfig } from '../variables/chartconfig.js';
@@ -120,7 +120,7 @@ function _build_suite_statistics_config() {
     const callbackData = data[1]
     const suiteSelectSuites = document.getElementById("suiteSelectSuites").value;
     const isCombined = suiteSelectSuites === "All Suites Combined";
-    const relevantSuites = filteredSuites.filter(s => !exclude_from_suite_data("suite", s));
+    const relevantSuites = get_relevant_suites();
     const tooltipMeta = build_tooltip_meta(relevantSuites, 'elapsed_s', isCombined);
     var config;
     if (settings.graphTypes.suiteStatisticsGraphType == "line") {
@@ -179,7 +179,7 @@ function _build_suite_duration_config() {
     const suiteSelectSuites = document.getElementById("suiteSelectSuites").value;
     const isCombined = suiteSelectSuites === "All Suites Combined";
     // Filter suites the same way get_duration_graph_data does, so tooltip meta matches
-    const relevantSuites = filteredSuites.filter(s => !exclude_from_suite_data("suite", s));
+    const relevantSuites = get_relevant_suites();
     const tooltipMeta = build_tooltip_meta(relevantSuites, 'elapsed_s', isCombined);
     var config;
     if (settings.graphTypes.suiteDurationGraphType == "bar") {
@@ -197,9 +197,14 @@ function _build_suite_duration_config() {
     return config;
 }
 
+function get_relevant_suites() {
+    const exclude_from_suite_data = get_suite_data_exclusion("suite");
+    return filteredSuites.filter(suite => !exclude_from_suite_data(suite));
+}
+
 function _get_suite_most_filtered_data() {
     if (!settings.switch.sectionFiltersApplySuite) return filteredSuites;
-    return filteredSuites.filter(s => !exclude_from_suite_data("suite", s));
+    return get_relevant_suites();
 }
 
 function _build_suite_most_failed_config() {
diff --git a/robotframework_dashboard/js/graph_creation/tables.js b/robotframework_dashboard/js/graph_creation/tables.js
index 2f6e44d0..dff796a3 100644
--- a/robotframework_dashboard/js/graph_creation/tables.js
+++ b/robotframework_dashboard/js/graph_creation/tables.js
@@ -38,31 +38,37 @@ function _get_exception_table_data() {
     ]);
 }
 
+// DataTables detects the type of a column by checking every cell on every update, which is slow
+// for large tables, so the columns get the type it would detect. Only the version is left to the
+// detection, because it can be numeric or free text depending on the project.
+function run_start_column() { return { title: "run", type: "date" }; }
+function number_column(title) { return { title, type: "num" }; }
+function text_column(title, type = "string") { return { title, type }; }
 const runColumns = [
-    { title: "run" }, { title: "full_name" }, { title: "name" }, { title: "total" },
-    { title: "passed" }, { title: "failed" }, { title: "skipped" }, { title: "elapsed_s" },
-    { title: "start_time" }, { title: "version" }, { title: "tags" }, { title: "alias" }, { title: "metadata" },
-    { title: "custom_filters" },
+    run_start_column(), text_column("full_name"), text_column("name"), number_column("total"),
+    number_column("passed"), number_column("failed"), number_column("skipped"), number_column("elapsed_s"),
+    text_column("start_time"), { title: "version" }, text_column("tags"), text_column("alias"), text_column("metadata"),
+    text_column("custom_filters"),
 ];
 const suiteColumns = [
-    { title: "run" }, { title: "full_name" }, { title: "name" }, { title: "total" },
-    { title: "passed" }, { title: "failed" }, { title: "skipped" }, { title: "elapsed_s" },
-    { title: "start_time" }, { title: "alias" }, { title: "id" },
+    run_start_column(), text_column("full_name"), text_column("name"), number_column("total"),
+    number_column("passed"), number_column("failed"), number_column("skipped"), number_column("elapsed_s"),
+    text_column("start_time"), text_column("alias"), text_column("id"),
 ];
 const testColumns = [
-    { title: "run" }, { title: "full_name" }, { title: "name" },
-    { title: "passed" }, { title: "failed" }, { title: "skipped" }, { title: "elapsed_s" },
-    { title: "start_time" }, { title: "message" }, { title: "tags" }, { title: "alias" }, { title: "id" },
-    { title: "attempts" },
+    run_start_column(), text_column("full_name"), text_column("name"),
+    number_column("passed"), number_column("failed"), number_column("skipped"), number_column("elapsed_s"),
+    text_column("start_time"), text_column("message", "html"), text_column("tags"), text_column("alias"), text_column("id"),
+    text_column("attempts", "string-utf8"),
 ];
 const keywordColumns = [
-    { title: "run" }, { title: "name" }, { title: "passed" }, { title: "failed" },
-    { title: "skipped" }, { title: "times_run" }, { title: "total_execution_time" },
-    { title: "average_execution_time" }, { title: "min_execution_time" },
-    { title: "max_execution_time" }, { title: "alias" }, { title: "owner" },
+    run_start_column(), text_column("name"), number_column("passed"), number_column("failed"),
+    number_column("skipped"), number_column("times_run"), number_column("total_execution_time"),
+    number_column("average_execution_time"), number_column("min_execution_time"),
+    number_column("max_execution_time"), text_column("alias"), text_column("owner"),
 ];
 const exceptionColumns = [
-    { title: "run" }, { title: "message" }, { title: "amount" }, { title: "alias" },
+    run_start_column(), text_column("message"), number_column("amount"), text_column("alias"),
 ];
 
 function create_data_table(tableId, columns, getDataFn) {
diff --git a/robotframework_dashboard/js/graph_data/duration.js b/robotframework_dashboard/js/graph_data/duration.js
index ec461927..79fb1b10 100644
--- a/robotframework_dashboard/js/graph_data/duration.js
+++ b/robotframework_dashboard/js/graph_data/duration.js
@@ -2,7 +2,7 @@ import { settings, get_run_label } from "../variables/settings.js";
 import { inFullscreen, inFullscreenGraph } from "../variables/globals.js";
 import { barConfig, lineConfig } from "../variables/chartconfig.js";
 import { compareRunIds } from "../variables/graphs.js";
-import { exclude_from_suite_data } from "./helpers.js";
+import { get_suite_data_exclusion } from "./helpers.js";
 import { strip_tz_suffix } from "../common.js";
 
 // function to prepare the data in the correct format for duration graphs
@@ -14,6 +14,7 @@ function get_duration_graph_data(dataType, graphType, objectDataAttribute, filte
     const keywordSelect = document.getElementById("keywordSelect").value;
     const useLibraryNames = settings?.switch?.useLibraryNames === true;
     const limit = inFullscreen && inFullscreenGraph.includes("Duration") ? 100 : 30;
+    const exclude_from_suite_data = get_suite_data_exclusion(dataType);
     const should_include = (value) => {
         if (dataType === "keyword") {
             const keywordKey = useLibraryNames && value.owner
@@ -22,7 +23,7 @@ function get_duration_graph_data(dataType, graphType, objectDataAttribute, filte
 
             if (keywordKey !== keywordSelect) return false;
         }
-        if (exclude_from_suite_data(dataType, value)) return false;
+        if (exclude_from_suite_data(value)) return false;
         if (settings.switch.suitePathsTestSection) {
             if (dataType === "test" && suiteSelectTests !== "All" &&
                 value.full_name !== `${suiteSelectTests}.${value.name}`) {
diff --git a/robotframework_dashboard/js/graph_data/failed.js b/robotframework_dashboard/js/graph_data/failed.js
index 06348e53..8146ebb5 100644
--- a/robotframework_dashboard/js/graph_data/failed.js
+++ b/robotframework_dashboard/js/graph_data/failed.js
@@ -1,6 +1,6 @@
 import { settings, get_run_label } from "../variables/settings.js";
 import { inFullscreen, inFullscreenGraph } from "../variables/globals.js";
-import { convert_timeline_data, parse_test_attempts } from "./helpers.js";
+import { convert_timeline_data, group_timeline_values, parse_test_attempts } from "./helpers.js";
 import { failedConfig, rerunBorderColor, rerunBorderWidth } from "../variables/chartconfig.js";
 import { strip_tz_suffix } from "../common.js";
 
@@ -93,13 +93,10 @@ function get_most_failed_data(dataType, graphType, filteredData, recent) {
         let datasets = [];
         let runAxis = 0;
         const pointMeta = {};
+        const groups = group_timeline_values(filteredData, labels, value => value.failed > 0 ? [getTestKey(value, dataType)] : []);
         for (const runStart of runStarts) {
             for (const label of labels) {
-                const foundValues = filteredData.filter(value =>
-                    getTestKey(value, dataType) === label &&
-                    value.run_start === runStart &&
-                    value.failed > 0
-                );
+                const foundValues = groups.get(label).get(runStart) ?? [];
                 if (foundValues.length > 0) {
                     const value = foundValues[0];
                     // tests re-executed with robot --rerunfailed (rebot --merge history) get the rerun border
diff --git a/robotframework_dashboard/js/graph_data/flaky.js b/robotframework_dashboard/js/graph_data/flaky.js
index 1198224d..10efaa75 100644
--- a/robotframework_dashboard/js/graph_data/flaky.js
+++ b/robotframework_dashboard/js/graph_data/flaky.js
@@ -1,6 +1,6 @@
 import { settings, get_run_label } from "../variables/settings.js";
 import { passedConfig, failedConfig, skippedConfig, rerunBorderColor, rerunBorderWidth } from "../variables/chartconfig.js";
-import { convert_timeline_data, parse_test_attempts, resolve_test_status, count_attempt_flips } from "./helpers.js";
+import { convert_timeline_data, group_timeline_values, parse_test_attempts, resolve_test_status, count_attempt_flips } from "./helpers.js";
 import { strip_tz_suffix } from "../common.js";
 
 // function to prepare the data in the correct format for (recent) most flaky test graph
@@ -77,36 +77,28 @@ function get_most_flaky_data(dataType, graphType, filteredData, ignore, recent,
         };
         return [graphData, data];
     } else if (graphType == "timeline") {
-        var [labels, runStarts, count, run_labels] = [[], [], 0, []];
+        var [labels, runStartsSet, count, runLabelsSet] = [[], new Set(), 0, new Set()];
         for (const key in sortedData) {
             if (count == limit) {
                 break;
             }
             labels.push(sortedData[key][0]);
             for (const runStart of sortedData[key][1].run_starts) {
-                if (!runStarts.includes(runStart)) {
-                    runStarts.push(runStart);
-                }
+                runStartsSet.add(runStart);
             }
             count += 1;
         }
         var datasets = [];
         var runAxis = 0;
         const pointMeta = {};
-        runStarts = runStarts.sort((a, b) => new Date(strip_tz_suffix(a)).getTime() - new Date(strip_tz_suffix(b)).getTime())
+        var runStarts = [...runStartsSet].sort((a, b) => new Date(strip_tz_suffix(a)).getTime() - new Date(strip_tz_suffix(b)).getTime())
+        const groups = group_timeline_values(filteredData, labels, value => [settings.switch.suitePathsTestSection ? value.full_name : value.name]);
         for (const runStart of runStarts) {
             for (const label of labels) {
-                var foundValues = [];
-                for (value of filteredData) {
-                    const compareKey = settings.switch.suitePathsTestSection ? value.full_name : value.name;
-                    if (compareKey == label && value.run_start == runStart) {
-                        foundValues.push(value);
-                        const runLabel = get_run_label(value);
-                        if (!run_labels.includes(runLabel)) { run_labels.push(runLabel) }
-                    }
-                }
+                const foundValues = groups.get(label).get(runStart) ?? [];
+                foundValues.forEach(value => runLabelsSet.add(get_run_label(value)));
                 if (foundValues.length > 0) {
-                    var value = foundValues[0];
+                    const value = foundValues[0];
                     const [status, attempts] = status_of(value);
                     const statusName = status === "passed" ? "PASS" : status === "failed" ? "FAIL" : "SKIP";
                     pointMeta[`${label}::${runAxis}`] = {
@@ -127,7 +119,7 @@ function get_most_flaky_data(dataType, graphType, filteredData, ignore, recent,
             }
             runAxis += 1;
         }
-        if (settings.show.aliases === "alias" || settings.show.aliases === "run_name") { runStarts = run_labels }
+        if (settings.show.aliases === "alias" || settings.show.aliases === "run_name") { runStarts = [...runLabelsSet] }
         datasets = convert_timeline_data(datasets)
         var graphData = {
             labels: labels,
diff --git a/robotframework_dashboard/js/graph_data/helpers.js b/robotframework_dashboard/js/graph_data/helpers.js
index a60257fa..21df83ac 100644
--- a/robotframework_dashboard/js/graph_data/helpers.js
+++ b/robotframework_dashboard/js/graph_data/helpers.js
@@ -3,43 +3,58 @@ import { barConfig } from "../variables/chartconfig.js";
 import { inFullscreen}  from "../variables/globals.js";
 
 // helper function to more easily use the logic of filtering suite graph data based on the selected filters
-// returns true if the value should be excluded, false if it should be included
-function exclude_from_suite_data(dataType, value) {
-    if (dataType !== "suite") return false;
+// returns a function that returns true if a value should be excluded, false if it should be included
+// the selected filters are read once here instead of once per value
+function get_suite_data_exclusion(dataType) {
+    if (dataType !== "suite") return () => false;
     const suiteSelectSuites = document.getElementById("suiteSelectSuites").value;
-    const suiteSelectSuitesOptions = [...document.getElementById("suiteSelectSuites").options].map(o => o.value);
+    const suiteSelectSuitesOptions = new Set([...document.getElementById("suiteSelectSuites").options].map(o => o.value));
     const suiteFolder = document.getElementById("suiteFolder").innerText;
     const isFolderAll = suiteFolder === "All";
     const isSuiteAll = suiteSelectSuites === "All Suites Separate" || suiteSelectSuites === "All Suites Combined";
     const usingSuitePaths = settings.switch.suitePathsSuiteSection;
 
     const folderMatches = (val) => val.full_name === suiteFolder || val.full_name.startsWith(`${suiteFolder}.`);
-    const suiteNameMatches = (val) => suiteSelectSuitesOptions.includes(val.name);
-    const fullNameMatches = (val) => suiteSelectSuitesOptions.includes(val.full_name);
+    const suiteNameMatches = (val) => suiteSelectSuitesOptions.has(val.name);
+    const fullNameMatches = (val) => suiteSelectSuitesOptions.has(val.full_name);
+    const selectedSuiteMismatch = (val) => usingSuitePaths
+        ? val.full_name !== suiteSelectSuites
+        : val.name !== suiteSelectSuites;
 
     if (isFolderAll && isSuiteAll) {
         // All folders, all suites: include all
-        return false;
+        return () => false;
     }
     if (isFolderAll && !isSuiteAll) {
         // All folders, specific suite
-        return usingSuitePaths
-            ? value.full_name !== suiteSelectSuites
-            : value.name !== suiteSelectSuites;
+        return selectedSuiteMismatch;
     }
     if (!isFolderAll && isSuiteAll) {
         // Specific folder, all suites
-        if (!folderMatches(value)) return true;
-
-        return usingSuitePaths
-            ? !fullNameMatches(value)
-            : !suiteNameMatches(value);
+        return (value) => {
+            if (!folderMatches(value)) return true;
+            return usingSuitePaths
+                ? !fullNameMatches(value)
+                : !suiteNameMatches(value);
+        };
     }
     // Specific folder, specific suite
-    if (!folderMatches(value)) return true;
-    return usingSuitePaths
-        ? value.full_name !== suiteSelectSuites
-        : value.name !== suiteSelectSuites;
+    return (value) => !folderMatches(value) || selectedSuiteMismatch(value);
+}
+
+// function to group timeline rows by label and run_start in one pass
+// returns Map(label -> Map(run_start -> [rows])), rows whose labels are not in labels are skipped
+function group_timeline_values(data, labels, get_labels) {
+    const groups = new Map(labels.map(label => [label, new Map()]));
+    for (const value of data) {
+        for (const label of get_labels(value)) {
+            const byRunStart = groups.get(label);
+            if (!byRunStart) continue;
+            if (!byRunStart.has(value.run_start)) byRunStart.set(value.run_start, []);
+            byRunStart.get(value.run_start).push(value);
+        }
+    }
+    return groups;
 }
 
 // function to update the height of the test statistics graph and enable scrolling
@@ -170,7 +185,8 @@ function format_attempt_lines(attempts, maxMessageLength = 80) {
 }
 
 export {
-    exclude_from_suite_data,
+    get_suite_data_exclusion,
+    group_timeline_values,
     update_height,
     convert_timeline_data,
     parse_test_attempts,
diff --git a/robotframework_dashboard/js/graph_data/messages.js b/robotframework_dashboard/js/graph_data/messages.js
index 3e764d49..7e5b3c4c 100644
--- a/robotframework_dashboard/js/graph_data/messages.js
+++ b/robotframework_dashboard/js/graph_data/messages.js
@@ -2,7 +2,7 @@ import { settings, get_run_label } from "../variables/settings.js";
 import { inFullscreen, inFullscreenGraph } from "../variables/globals.js";
 import { failedConfig, rerunBorderColor, rerunBorderWidth } from "../variables/chartconfig.js";
 import { message_config } from "../variables/data.js";
-import { convert_timeline_data, parse_test_attempts } from "./helpers.js";
+import { convert_timeline_data, group_timeline_values, parse_test_attempts } from "./helpers.js";
 import { strip_tz_suffix } from "../common.js";
 
 // function to prepare the data in the correct format for messages graphs
@@ -22,13 +22,18 @@ function get_messages_data(dataType, graphType, filteredData) {
             run_names.get(value.message).push(value.run_name);
         }
     }
-    // If there is a message config use that to merge the data
-    if (!message_config.includes("placeholder_message_config")) {
-        function matches_message_config(str, rule) {
-            rule = rule.replace(/\$\{.*?\}/g, "*") // match any ${something} string
-            var escapeRegex = (str) => str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1"); // escape the test messages to prevent regex mismatches
-            return new RegExp("^" + rule.split("*").map(escapeRegex).join(".*") + "$").test(str);
+    const useMessageConfig = !message_config.includes("placeholder_message_config");
+    const messageConfigRegexes = new Map();
+    function matches_message_config(str, rule) {
+        if (!messageConfigRegexes.has(rule)) {
+            const wildcardRule = rule.replace(/\$\{.*?\}/g, "*") // match any ${something} string
+            const escapeRegex = (str) => str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1"); // escape the test messages to prevent regex mismatches
+            messageConfigRegexes.set(rule, new RegExp("^" + wildcardRule.split("*").map(escapeRegex).join(".*") + "$"));
         }
+        return messageConfigRegexes.get(rule).test(str);
+    }
+    // If there is a message config use that to merge the data
+    if (useMessageConfig) {
         for (const config of message_config) {
             for (const [message, runStarts] of data) {
                 if (message == config) { continue }
@@ -43,8 +48,7 @@ function get_messages_data(dataType, graphType, filteredData) {
         }
 
         for (const [message, runStarts] of data) {
-            arrayWithDuplicates = data.get(message)
-            data.set(message, [...new Set(arrayWithDuplicates)])
+            data.set(message, [...new Set(runStarts)])
         }
     }
     const limit = inFullscreen && inFullscreenGraph.includes("Messages") ? 50 : 10;
@@ -94,14 +98,13 @@ function get_messages_data(dataType, graphType, filteredData) {
         var datasets = [];
         let runAxis = 0;
         const pointMeta = {};
-        function check_label(message, label) {
-            return !message_config.includes("placeholder_message_config")
-                ? matches_message_config(message, label)
-                : message === label;
-        }
+        // with a message config one message can match more than one label
+        const groups = group_timeline_values(filteredData, labels, value => useMessageConfig
+            ? labels.filter(label => matches_message_config(value.message, label))
+            : [value.message]);
         for (const runStart of runStarts) {
             for (const label of labels) {
-                const foundValues = filteredData.filter(value => check_label(value.message, label) && value.run_start === runStart);
+                const foundValues = groups.get(label).get(runStart) ?? [];
                 if (foundValues.length > 0) {
                     const value = foundValues[0];
                     // tests re-executed with robot --rerunfailed (rebot --merge history) get the rerun border
diff --git a/robotframework_dashboard/js/graph_data/statistics.js b/robotframework_dashboard/js/graph_data/statistics.js
index 67027039..a9184665 100644
--- a/robotframework_dashboard/js/graph_data/statistics.js
+++ b/robotframework_dashboard/js/graph_data/statistics.js
@@ -14,7 +14,7 @@ import {
     rerunBorderWidth
 } from "../variables/chartconfig.js";
 import { settings, get_run_label } from "../variables/settings.js";
-import { convert_timeline_data, exclude_from_suite_data, parse_test_attempts, resolve_test_status } from "./helpers.js";
+import { convert_timeline_data, get_suite_data_exclusion, parse_test_attempts, resolve_test_status } from "./helpers.js";
 import { compareRunIds } from "../variables/graphs.js";
 
 // function to prepare the data in the correct format for statistics graphs
@@ -33,8 +33,9 @@ function get_statistics_graph_data(dataType, graphType, filteredData) {
         runNames.push(value.run_name ?? value.name);
         names.push(value.name);
     };
+    const exclude_from_suite_data = get_suite_data_exclusion(dataType);
     for (const value of filteredData) {
-        if (exclude_from_suite_data(dataType, value)) continue;
+        if (exclude_from_suite_data(value)) continue;
         if (dataType === "keyword") {
             const keywordKey = useLibraryNames && value.owner
                 ? `${value.owner}.${value.name}`
diff --git a/robotframework_dashboard/js/graph_data/tooltip_helpers.js b/robotframework_dashboard/js/graph_data/tooltip_helpers.js
index 545b6a14..781c3a0d 100644
--- a/robotframework_dashboard/js/graph_data/tooltip_helpers.js
+++ b/robotframework_dashboard/js/graph_data/tooltip_helpers.js
@@ -4,6 +4,8 @@
 function build_tooltip_meta(filteredData, durationField = 'elapsed_s', aggregate = false) {
     const byLabel = {};
     const byTime = {};
+    // many rows share a run_start, so every run_start is parsed only once
+    const timeKeys = new Map();
     for (const item of filteredData) {
         const elapsed = parseFloat(item[durationField]) || 0;
         const p = item.passed || 0;
@@ -11,7 +13,10 @@ function build_tooltip_meta(filteredData, durationField = 'elapsed_s', aggregate
         const s = item.skipped || 0;
         const msg = item.message || '';
         const keys = [item.run_start, item.run_alias];
-        const timeKey = new Date(item.run_start.replace(" ", "T")).getTime();
+        if (!timeKeys.has(item.run_start)) {
+            timeKeys.set(item.run_start, new Date(item.run_start.replace(" ", "T")).getTime());
+        }
+        const timeKey = timeKeys.get(item.run_start);
         const meta = { elapsed_s: elapsed, passed: p, failed: f, skipped: s, message: msg };
         for (const key of keys) {
             if (aggregate && byLabel[key]) {
diff --git a/robotframework_dashboard/js/main.js b/robotframework_dashboard/js/main.js
index 72f415cc..e1df835c 100644
--- a/robotframework_dashboard/js/main.js
+++ b/robotframework_dashboard/js/main.js
@@ -6,10 +6,12 @@ import { setup_collapsables } from "./eventlisteners/collapsables.js";
 import { setup_filter_modal } from "./eventlisteners/filter_modal.js";
 import { setup_settings_modal } from "./eventlisteners/settings_modal.js";
 import { setup_menu, setup_navbar_overflow } from "./menu.js";
+import { load_data } from "./variables/data.js";
 
 // function that triggers all functions that should be executed when the dashboard is loaded first
 // in the correct order!
-function main() {
+async function main() {
+    await load_data();
     setup_local_storage();
     setup_database_stats();
     setup_dashboard_section_layout_buttons();
diff --git a/robotframework_dashboard/js/variables/data.js b/robotframework_dashboard/js/variables/data.js
index 3de99b69..82d15f64 100644
--- a/robotframework_dashboard/js/variables/data.js
+++ b/robotframework_dashboard/js/variables/data.js
@@ -1,15 +1,31 @@
-// prepare input data
-const runs = decode_and_decompress("placeholder_runs");
-const suites = decode_and_decompress("placeholder_suites");
-const tests = decode_and_decompress("placeholder_tests");
-const keywords = decode_and_decompress("placeholder_keywords");
-const exceptions = decode_and_decompress("placeholder_exceptions");
+// the input data, filled by load_data() which main() awaits before anything reads it
+let runs = [];
+let suites = [];
+let tests = [];
+let keywords = [];
+let exceptions = [];
 
-function decode_and_decompress(base64Str) {
+async function load_data() {
+    [runs, suites, tests, keywords, exceptions] = await Promise.all([
+        decode_and_decompress("placeholder_runs"),
+        decode_and_decompress("placeholder_suites"),
+        decode_and_decompress("placeholder_tests"),
+        decode_and_decompress("placeholder_keywords"),
+        decode_and_decompress("placeholder_exceptions"),
+    ]);
+}
+
+// the payloads are zlib compressed JSON, inflated with the native DecompressionStream
+async function decode_and_decompress(base64Str) {
     if (base64Str.includes("placeholder_")) return [];
-    const compressedData = Uint8Array.from(atob(base64Str), c => c.charCodeAt(0));
-    const decompressedData = pako.inflate(compressedData, { toText: true });
-    return JSON.parse(decompressedData);
+    // a plain loop is much faster than Uint8Array.from with a map callback on large payloads
+    const binaryStr = atob(base64Str);
+    const compressedData = new Uint8Array(binaryStr.length);
+    for (let i = 0; i < binaryStr.length; i++) {
+        compressedData[i] = binaryStr.charCodeAt(i);
+    }
+    const stream = new Blob([compressedData]).stream().pipeThrough(new DecompressionStream("deflate"));
+    return new Response(stream).json();
 }
 
 var unified_dashboard_title = '"placeholder_dashboard_title"'
@@ -24,6 +40,7 @@ const no_auto_update = "placeholder_no_autoupdate"
 if (!message_config.includes("placeholder_message_config")) { message_config = JSON.parse(message_config) }
 
 export {
+    load_data,
     runs,
     suites,
     tests,
diff --git a/robotframework_dashboard/licenses/THIRD_PARTY_LICENSES.txt b/robotframework_dashboard/licenses/THIRD_PARTY_LICENSES.txt
index 6dffbe48..c7e47585 100644
--- a/robotframework_dashboard/licenses/THIRD_PARTY_LICENSES.txt
+++ b/robotframework_dashboard/licenses/THIRD_PARTY_LICENSES.txt
@@ -229,31 +229,3 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
-
-========================================
-Pako
-https://github.com/nodeca/pako
-Version: 3.0.2
-License: MIT
-========================================
-(The MIT License)
-
-Copyright (C) 2014-2017 by Vitaly Puzrin and Andrei Tuputcyn
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
diff --git a/tests/javascript/filter.test.js b/tests/javascript/filter.test.js
index aaee9864..ad6b6788 100644
--- a/tests/javascript/filter.test.js
+++ b/tests/javascript/filter.test.js
@@ -5,13 +5,15 @@ vi.mock('@js/variables/data.js', () => import('./mocks/data.js'));
 vi.mock('@js/variables/graphs.js', () => import('./mocks/graphs.js'));
 
 import { strip_tz_suffix, get_run_projects } from '@js/common.js';
-import { strip_tz_suffix } from '@js/common.js';
 import {
     dashboardPages,
     get_active_page,
     get_hidden_custom_filters,
+    get_transformed_data,
     parse_custom_filters,
+    sort_wall_clock,
 } from '@js/filter/pipeline.js';
+import { runs } from '@js/variables/data.js';
 import { settings } from '@js/variables/settings.js';
 
 // settings is module level state, so it is restored between tests
@@ -27,15 +29,6 @@ beforeEach(() => {
 // so here we test the reusable logic patterns (sorting, data transformations)
 // that the filter functions rely on.
 
-// Reimplementation of sort_wall_clock from filter.js for direct testing
-function sort_wall_clock(data) {
-    return [...data].sort((a, b) => {
-        const ak = strip_tz_suffix(a.run_start);
-        const bk = strip_tz_suffix(b.run_start);
-        return ak < bk ? -1 : ak > bk ? 1 : 0;
-    });
-}
-
 describe('filter.js pure logic', () => {
     describe('sort_wall_clock logic', () => {
 
@@ -87,6 +80,47 @@ describe('filter.js pure logic', () => {
             sort_wall_clock(data);
             expect(data).toEqual(original);
         });
+
+        it('keeps the original order of items with the same wall-clock time', () => {
+            const data = [
+                { run_start: '2025-01-15 10:00:00', name: 'b' },
+                { run_start: '2025-01-15 09:00:00', name: 'c' },
+                { run_start: '2025-01-15 10:00:00+02:00', name: 'a' },
+            ];
+            expect(sort_wall_clock(data).map(item => item.name)).toEqual(['c', 'b', 'a']);
+        });
+    });
+
+    describe('get_transformed_data', () => {
+        beforeEach(() => {
+            runs.length = 0;
+            runs.push({ run_start: '2025-01-15 09:05:03.123+02:00', name: 'run1' });
+            settings.show.milliseconds = true;
+            settings.show.timezones = true;
+            settings.show.convertTimezone = false;
+        });
+
+        it('applies the run_start transformations of the settings', () => {
+            settings.show.milliseconds = false;
+            settings.show.timezones = false;
+            expect(get_transformed_data('runs')[0].run_start).toBe('2025-01-15 09:05:03');
+            expect(runs[0].run_start).toBe('2025-01-15 09:05:03.123+02:00');
+        });
+
+        it('reuses the transformed data while the settings stay the same', () => {
+            settings.show.milliseconds = false;
+            const first = get_transformed_data('runs');
+            expect(get_transformed_data('runs')).toBe(first);
+        });
+
+        it('transforms again when one of the settings changes', () => {
+            settings.show.milliseconds = false;
+            expect(get_transformed_data('runs')[0].run_start).toBe('2025-01-15 09:05:03+02:00');
+            settings.show.timezones = false;
+            expect(get_transformed_data('runs')[0].run_start).toBe('2025-01-15 09:05:03');
+            settings.show.milliseconds = true;
+            expect(get_transformed_data('runs')[0].run_start).toBe('2025-01-15 09:05:03.123');
+        });
     });
 
     describe('remove_milliseconds logic', () => {
@@ -174,8 +208,8 @@ describe('filter.js pure logic', () => {
                 { run_start: '2025-01-15 10:00:00', name: 'suite2' },
                 { run_start: '2025-01-15 11:00:00', name: 'suite3' },
             ];
-            const validRunStarts = filteredRuns.map(v => v.run_start);
-            const result = data.filter(v => validRunStarts.includes(v.run_start));
+            const validRunStarts = new Set(filteredRuns.map(v => v.run_start));
+            const result = data.filter(v => validRunStarts.has(v.run_start));
             expect(result).toHaveLength(2);
             expect(result[0].name).toBe('suite1');
             expect(result[1].name).toBe('suite2');
@@ -186,8 +220,8 @@ describe('filter.js pure logic', () => {
             const data = [
                 { run_start: '2025-01-15 09:00:00', name: 'suite1' },
             ];
-            const validRunStarts = filteredRuns.map(v => v.run_start);
-            const result = data.filter(v => validRunStarts.includes(v.run_start));
+            const validRunStarts = new Set(filteredRuns.map(v => v.run_start));
+            const result = data.filter(v => validRunStarts.has(v.run_start));
             expect(result).toHaveLength(0);
         });
     });
diff --git a/tests/javascript/graph_data/helpers.test.js b/tests/javascript/graph_data/helpers.test.js
index 3cd0211c..466e002f 100644
--- a/tests/javascript/graph_data/helpers.test.js
+++ b/tests/javascript/graph_data/helpers.test.js
@@ -1,4 +1,4 @@
-import { describe, it, expect, vi } from 'vitest';
+import { describe, it, expect, vi, afterEach } from 'vitest';
 
 vi.mock('@js/variables/settings.js', () => ({
     settings: {
@@ -17,7 +17,8 @@ vi.mock('@js/variables/globals.js', () => ({
     inFullscreenGraph: '',
 }));
 
-import { convert_timeline_data, parse_test_attempts, resolve_test_status, format_attempt_lines, count_attempt_flips, get_rerun_summary } from '@js/graph_data/helpers.js';
+import { convert_timeline_data, parse_test_attempts, resolve_test_status, format_attempt_lines, count_attempt_flips, get_rerun_summary, group_timeline_values, get_suite_data_exclusion } from '@js/graph_data/helpers.js';
+import { settings } from '@js/variables/settings.js';
 
 
 describe('convert_timeline_data', () => {
@@ -189,3 +190,93 @@ describe('get_rerun_summary', () => {
     });
 });
 
+
+describe('group_timeline_values', () => {
+    const rows = [
+        { name: 'A', run_start: 'r1', id: 1 },
+        { name: 'B', run_start: 'r1', id: 2 },
+        { name: 'A', run_start: 'r2', id: 3 },
+        { name: 'A', run_start: 'r1', id: 4 },
+        { name: 'C', run_start: 'r1', id: 5 },
+    ];
+
+    it('groups the rows by label and run_start in their original order', () => {
+        const groups = group_timeline_values(rows, ['A', 'B'], row => [row.name]);
+        expect(groups.get('A').get('r1').map(row => row.id)).toEqual([1, 4]);
+        expect(groups.get('A').get('r2').map(row => row.id)).toEqual([3]);
+        expect(groups.get('B').get('r1').map(row => row.id)).toEqual([2]);
+        expect(groups.get('B').get('r2')).toBeUndefined();
+    });
+
+    it('only keeps the given labels', () => {
+        const groups = group_timeline_values(rows, ['B'], row => [row.name]);
+        expect([...groups.keys()]).toEqual(['B']);
+    });
+
+    it('adds a row to every label it belongs to and skips rows without a label', () => {
+        const groups = group_timeline_values(rows, ['A', 'any'], row => row.name === 'A' ? ['A', 'any'] : []);
+        expect(groups.get('any').get('r1').map(row => row.id)).toEqual([1, 4]);
+        expect(groups.get('A').get('r1').map(row => row.id)).toEqual([1, 4]);
+    });
+});
+
+describe('get_suite_data_exclusion', () => {
+    const suites = [
+        { name: 'Login', full_name: 'Web.Login' },
+        { name: 'Cart', full_name: 'Web.Cart' },
+        { name: 'Login', full_name: 'Api.Login' },
+    ];
+    let reads = 0;
+    function stub_document(suiteSelect, options, folder) {
+        reads = 0;
+        globalThis.document = {
+            getElementById: (id) => {
+                reads++;
+                if (id === 'suiteSelectSuites') return { value: suiteSelect, options: options.map(value => ({ value })) };
+                if (id === 'suiteFolder') return { innerText: folder };
+                return null;
+            },
+        };
+    }
+    const kept = (exclude) => suites.filter(suite => !exclude(suite)).map(suite => suite.full_name);
+
+    afterEach(() => {
+        delete globalThis.document;
+        settings.switch.suitePathsSuiteSection = false;
+    });
+
+    it('never excludes data that is not suite data', () => {
+        expect(get_suite_data_exclusion('test')(suites[0])).toBe(false);
+    });
+
+    it('keeps every suite with all folders and all suites selected', () => {
+        stub_document('All Suites Separate', [], 'All');
+        expect(kept(get_suite_data_exclusion('suite'))).toEqual(['Web.Login', 'Web.Cart', 'Api.Login']);
+    });
+
+    it('keeps the selected suite by name, or by full name with suite paths', () => {
+        stub_document('Login', [], 'All');
+        expect(kept(get_suite_data_exclusion('suite'))).toEqual(['Web.Login', 'Api.Login']);
+        settings.switch.suitePathsSuiteSection = true;
+        stub_document('Api.Login', [], 'All');
+        expect(kept(get_suite_data_exclusion('suite'))).toEqual(['Api.Login']);
+    });
+
+    it('keeps the suites of the selected folder that are in the suite select', () => {
+        stub_document('All Suites Combined', ['All Suites Separate', 'All Suites Combined', 'Login', 'Cart'], 'Web');
+        expect(kept(get_suite_data_exclusion('suite'))).toEqual(['Web.Login', 'Web.Cart']);
+    });
+
+    it('keeps the selected suite inside the selected folder', () => {
+        stub_document('Login', [], 'Web');
+        expect(kept(get_suite_data_exclusion('suite'))).toEqual(['Web.Login']);
+    });
+
+    it('reads the selected filters once instead of once per suite', () => {
+        stub_document('Login', ['Login', 'Cart'], 'Web');
+        const exclude = get_suite_data_exclusion('suite');
+        const readsAfterSetup = reads;
+        suites.forEach(suite => exclude(suite));
+        expect(reads).toBe(readsAfterSetup);
+    });
+});
diff --git a/tests/javascript/graph_data/messages_config.test.js b/tests/javascript/graph_data/messages_config.test.js
new file mode 100644
index 00000000..8981dabe
--- /dev/null
+++ b/tests/javascript/graph_data/messages_config.test.js
@@ -0,0 +1,61 @@
+import { describe, it, expect, vi } from 'vitest';
+
+// message_config is module state, so the message config tests live in their own file
+vi.mock('@js/variables/settings.js', () => ({
+    settings: { show: { aliases: 'run_start' }, switch: { testRerunView: 'reruns' } },
+    get_run_label: (item) => item.run_start,
+}));
+vi.mock('@js/variables/globals.js', () => ({
+    inFullscreen: false,
+    inFullscreenGraph: '',
+}));
+vi.mock('@js/variables/chartconfig.js', () => ({
+    failedConfig: { backgroundColor: 'rgba(206, 62, 1, 0.7)', borderColor: '#ce3e01' },
+    rerunBorderColor: '#36a2eb',
+    rerunBorderWidth: 3,
+}));
+vi.mock('@js/variables/data.js', () => ({
+    message_config: ['Element ${locator} not found', 'Timeout after * seconds'],
+}));
+vi.mock('@js/graph_data/helpers.js', async () => ({
+    ...(await vi.importActual('@js/graph_data/helpers.js')),
+    convert_timeline_data: (datasets) => datasets,
+}));
+vi.mock('@js/common.js', () => ({
+    strip_tz_suffix: (s) => s.replace(/[+-]\d{2}:\d{2}$/, ''),
+}));
+
+import { get_messages_data } from '@js/graph_data/messages.js';
+
+function make_test(run_start, message) {
+    return { name: 'Test', run_start, run_alias: run_start, passed: 0, failed: 1, skipped: 0, elapsed_s: 1, message, attempts: '' };
+}
+
+describe('get_messages_data with a message config', () => {
+    const data = [
+        make_test('2025-01-15 10:00:00', 'Element id:login not found'),
+        make_test('2025-01-15 10:00:00', 'Timeout after 5 seconds'),
+        make_test('2025-01-16 10:00:00', 'Element id:cart not found'),
+        make_test('2025-01-16 10:00:00', 'Element id:cart not found'),
+        make_test('2025-01-17 10:00:00', 'Something else'),
+    ];
+
+    it('merges the messages that match a rule in the bar graph', () => {
+        const [graphData] = get_messages_data('test', 'bar', data);
+        expect(graphData.labels).toEqual(['Element ${locator} not found', 'Something else', 'Timeout after * seconds']);
+        expect(graphData.datasets[0].data).toEqual([2, 1, 1]);
+    });
+
+    it('puts every matching message in the cell of its rule and run in the timeline', () => {
+        const [graphData, runStarts, pointMeta] = get_messages_data('test', 'timeline', data);
+        expect(runStarts).toEqual(['2025-01-15 10:00:00', '2025-01-16 10:00:00', '2025-01-17 10:00:00']);
+        const cells = graphData.datasets.map(dataset => `${dataset.label}@${dataset.data[0].x[0]}`);
+        expect(cells).toEqual([
+            'Element ${locator} not found@0',
+            'Timeout after * seconds@0',
+            'Element ${locator} not found@1',
+            'Something else@2',
+        ]);
+        expect(pointMeta['Element ${locator} not found::1'].message).toBe('Element id:cart not found');
+    });
+});
diff --git a/tests/python/test_dashboard.py b/tests/python/test_dashboard.py
index fd1c5180..aaea2c05 100644
--- a/tests/python/test_dashboard.py
+++ b/tests/python/test_dashboard.py
@@ -5,6 +5,15 @@
 import pytest
 from robotframework_dashboard.dashboard import DashboardGenerator
 
+EMBEDDED_PAYLOAD_ORDER = ["runs", "suites", "tests", "keywords", "exceptions"]
+
+
+def _embedded_payload(content, name):
+    """Decode one embedded data payload, load_data() in data.js decodes them in this order."""
+    payloads = re.findall(r'decode_and_decompress\("([^"]+)"\)', content)
+    assert len(payloads) == len(EMBEDDED_PAYLOAD_ORDER), "data payloads not found in dashboard"
+    return json.loads(zlib.decompress(base64.b64decode(payloads[EMBEDDED_PAYLOAD_ORDER.index(name)])))
+
 
 def test_compress_and_encode_returns_string():
     result = DashboardGenerator()._compress_and_encode({"key": "value"})
@@ -317,9 +326,7 @@ def test_generate_dashboard_uselogs_embeds_relative_paths(tmp_path):
     )
     content = dashboard.read_text(encoding="utf-8")
     # Extract the base64 payload for runs
-    match = re.search(r'const runs = decode_and_decompress\("([^"]+)"\)', content)
-    assert match, "runs payload not found in dashboard"
-    decoded = json.loads(zlib.decompress(base64.b64decode(match.group(1))))
+    decoded = _embedded_payload(content, "runs")
     assert decoded[0]["path"] == "output.xml"
     assert str(tmp_path).replace("\\", "/") not in decoded[0]["path"]
 
@@ -346,9 +353,7 @@ def test_generate_dashboard_server_mode_keeps_absolute_paths(tmp_path):
         no_autoupdate=False,
     )
     content = dashboard.read_text(encoding="utf-8")
-    match = re.search(r'const runs = decode_and_decompress\("([^"]+)"\)', content)
-    assert match, "runs payload not found in dashboard"
-    decoded = json.loads(zlib.decompress(base64.b64decode(match.group(1))))
+    decoded = _embedded_payload(content, "runs")
     assert decoded[0]["path"] == abs_path
 
 
@@ -374,9 +379,7 @@ def test_generate_dashboard_embeds_exceptions(tmp_path):
         no_autoupdate=False,
     )
     content = dashboard.read_text(encoding="utf-8")
-    match = re.search(r'const exceptions = decode_and_decompress\("([^"]+)"\)', content)
-    assert match, "exceptions payload not found in dashboard"
-    decoded = json.loads(zlib.decompress(base64.b64decode(match.group(1))))
+    decoded = _embedded_payload(content, "exceptions")
     assert decoded[0]["message"] == "Timeout error"
     assert decoded[0]["amount"] == 2
 
@@ -401,7 +404,5 @@ def test_generate_dashboard_missing_exceptions_key_defaults_to_empty(tmp_path):
     )
     content = dashboard.read_text(encoding="utf-8")
     import json, zlib, base64, re
-    match = re.search(r'const exceptions = decode_and_decompress\("([^"]+)"\)', content)
-    assert match, "exceptions payload not found in dashboard"
-    decoded = json.loads(zlib.decompress(base64.b64decode(match.group(1))))
+    decoded = _embedded_payload(content, "exceptions")
     assert decoded == []