diff --git a/src/lib/format.ts b/src/lib/format.ts
index 345259d..7241eaa 100644
--- a/src/lib/format.ts
+++ b/src/lib/format.ts
@@ -19,13 +19,40 @@ export function percent(received: number, total: number): number {
   return Math.min(100, Math.round((received / total) * 100));
 }
 
-/** Compare "1.2.10" vs "1.2.9" numerically per segment. Good enough for mod versions. */
+/**
+ * Compare "1.2.10" vs "1.2.9" numerically per segment.
+ * Single-pass numerical segment parsing eliminates string split and array allocations during list operations.
+ */
 export function compareVersions(a: string, b: string): number {
-  const pa = a.split(".").map((s) => parseInt(s, 10) || 0);
-  const pb = b.split(".").map((s) => parseInt(s, 10) || 0);
-  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
-    const diff = (pa[i] ?? 0) - (pb[i] ?? 0);
-    if (diff !== 0) return diff;
+  let i = 0;
+  let j = 0;
+  const lenA = a.length;
+  const lenB = b.length;
+
+  while (i < lenA || j < lenB) {
+    let numA = 0;
+    while (i < lenA && a.charCodeAt(i) !== 46 /* '.' */) {
+      const code = a.charCodeAt(i);
+      if (code >= 48 && code <= 57) {
+        numA = numA * 10 + (code - 48);
+      }
+      i++;
+    }
+    if (i < lenA) i++;
+
+    let numB = 0;
+    while (j < lenB && b.charCodeAt(j) !== 46 /* '.' */) {
+      const code = b.charCodeAt(j);
+      if (code >= 48 && code <= 57) {
+        numB = numB * 10 + (code - 48);
+      }
+      j++;
+    }
+    if (j < lenB) j++;
+
+    if (numA !== numB) {
+      return numA - numB;
+    }
   }
   return 0;
 }
diff --git a/src/pages/InstalledPage.tsx b/src/pages/InstalledPage.tsx
index ef1b9df..a503de8 100644
--- a/src/pages/InstalledPage.tsx
+++ b/src/pages/InstalledPage.tsx
@@ -43,6 +43,9 @@ import Spinner from "../components/ui/Spinner";
 import { useConfirm } from "../components/ui/useConfirm";
 import type { InstalledMod, UpdatesReport } from "../types";
 
+/** Reuse a single Intl.Collator instance across list sorts to avoid repeated allocations. */
+const modNameCollator = new Intl.Collator(undefined, { sensitivity: "base" });
+
 /** Prevent interactive controls inside the row from toggling expansion. */
 function stopRow(e: React.MouseEvent) {
   e.stopPropagation();
@@ -448,8 +451,8 @@ export default function InstalledPage() {
       }
     }
     const cmp = (a: InstalledMod, b: InstalledMod) =>
-      a.name.localeCompare(b.name, undefined, { sensitivity: "base" }) ||
-      a.name.localeCompare(b.name);
+      modNameCollator.compare(a.name, b.name) ||
+      (a.name < b.name ? -1 : a.name > b.name ? 1 : 0);
     enabled.sort(cmp);
     disabled.sort(cmp);
     return { enabledMods: enabled, disabledMods: disabled };