diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 7d24e084d40..9417357aac9 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -15,8 +15,9 @@ jobs:
     #
     # The two paths build different schemas (migrations add triggers, checks and NOT VALID
     # constraints that `db:push` does not), so each runs the whole suite. Vitest splits each
-    # suite's files across four shards; a shard runs its files one at a time against its own
-    # database. Files run serially, so a shard barely uses more than one core: 4 vCPU is enough.
+    # suite's files across four shards by measured duration (DurationBalancedSequencer in vitest.shared.ts); a
+    # shard runs its files one at a time against its own database. Files run serially, so a shard
+    # barely uses more than one core: 4 vCPU is enough.
     name: integration (${{ matrix.provision }}, ${{ matrix.shard }}/4)
     runs-on: &runner-4vcpu ${{ (vars.CI_PROVIDER == '' || vars.CI_PROVIDER == 'blacksmith') && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-latest' }}
     timeout-minutes: 20
@@ -272,6 +273,23 @@ jobs:
         working-directory: packages/db
         run: bun run db:migrate
 
+      # Turbopack's dev cache turns the spec's route warm-up from a cold compile (~4 min) into a
+      # restore. It is content-addressed, so a pull request's changed modules still recompile; the
+      # key carries the installed Next version so an upgrade starts from an empty cache, and the
+      # event and fork segments keep untrusted runs off the cache trusted runs read.
+      - name: Resolve Turbopack dev cache key
+        id: next-cache
+        run: echo "key=${GITHUB_REPOSITORY}-next-dev-desktop-live-${GITHUB_EVENT_NAME}${FORK_SUFFIX}-$(jq -r .version node_modules/next/package.json)" >> "$GITHUB_OUTPUT"
+        env:
+          FORK_SUFFIX: ${{ github.event.pull_request.head.repo.fork && '-fork' || '' }}
+
+      - name: Mount Turbopack dev cache
+        uses: ./.github/actions/cache
+        with:
+          provider: ${{ vars.CI_PROVIDER }}
+          key: ${{ steps.next-cache.outputs.key }}
+          path: ./apps/sim/.next/dev
+
       # Chat switches, Stop, sign-out, approval and the flag-off foreground round trip. The spec
       # runs the recording proxy (the app's public origin) and the stand-in worker.
       - name: Verify desktop tools in the Electron app against a local app
@@ -292,39 +310,84 @@ jobs:
           READY_TIMEOUT_SECONDS: 300
         run: |
           report_dir="$RUNNER_TEMP/e2e"
+          next_log="$report_dir/desktop-tools-next.log"
           mkdir -p "$report_dir"
-          sudo apt-get update -q
-          sudo apt-get install -yq xvfb libgtk-3-0t64 libnss3 libasound2t64 libgbm1 libxss1 \
-            libxtst6 libatk-bridge2.0-0t64 libxkbcommon0 > /dev/null
-          # Bundle only: `bun run build` also fetches the macOS node-pty prebuilds for packaging,
-          # which a Linux run does not use.
-          (cd apps/desktop && bun run scripts/build.ts)
           # Each app runs in its own session under an E2E_APP tag, and stop-session.sh returns once
           # every process it started has exited.
           realtime_tag="desktop-realtime-$GITHUB_RUN_ID-$GITHUB_RUN_ATTEMPT-$$"
           server_tag="desktop-tools-$GITHUB_RUN_ID-$GITHUB_RUN_ATTEMPT-$$"
+          # Keeps the restored cache under the cap the dev scripts apply locally.
+          (cd apps/sim && bun run dev:cache:cap)
+          start_sim() {
+            (cd apps/sim && E2E_APP="$server_tag" exec setsid node ../../node_modules/next/dist/bin/next dev --hostname 127.0.0.1 \
+              --port 3021 >> "$next_log" 2>&1) &
+            server_pid=$!
+          }
+          # A corrupted cache aborts Turbopack instead of falling back. Only then is the shared cache
+          # dropped: a failing test must not cost every later run its warm cache.
+          cache_broken() {
+            grep -qiE 'cache corruption|turbopack.*panic|panicked' "$next_log" 2>/dev/null
+          }
+          # The cache directory is a mount point: empty it rather than remove it. Absolute, because
+          # the EXIT trap runs after the step has moved into apps/desktop.
+          clear_cache() {
+            find "$GITHUB_WORKSPACE/apps/sim/.next/dev" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
+          }
+          # SIGINT first: `next dev` SIGKILLs its server 100ms after SIGTERM, which discards a cache
+          # write in flight. stop-session.sh then removes anything still running.
+          # SIGINT is best-effort; the cleanup always runs, since workers and the detached telemetry
+          # flush can outlive a server that has already exited.
+          stop_sim() {
+            if kill -INT "$server_pid" 2>/dev/null; then
+              for _ in $(seq 1 30); do kill -0 "$server_pid" 2>/dev/null || break; sleep 1; done
+            fi
+            bash "$GITHUB_WORKSPACE/.github/scripts/stop-session.sh" "$server_pid" "$server_tag"
+          }
           (cd apps/realtime && PORT=3023 SIM_DB_ROLE=realtime ALLOWED_ORIGINS="$NEXT_PUBLIC_APP_URL" \
             E2E_APP="$realtime_tag" exec setsid bun src/index.ts > "$report_dir/desktop-tools-realtime.log" 2>&1) &
           realtime_pid=$!
-          (cd apps/sim && E2E_APP="$server_tag" exec setsid node ../../node_modules/next/dist/bin/next dev --hostname 127.0.0.1 \
-            --port 3021 > "$report_dir/desktop-tools-next.log" 2>&1) &
-          server_pid=$!
+          start_sim
           finish() {
             status=$?
-            bash "$GITHUB_WORKSPACE/.github/scripts/stop-session.sh" "$server_pid" "$server_tag" || status=1
+            stop_sim || status=1
             bash "$GITHUB_WORKSPACE/.github/scripts/stop-session.sh" "$realtime_pid" "$realtime_tag" || status=1
             wait "$server_pid" "$realtime_pid" 2>/dev/null || true
+            if cache_broken; then
+              echo "::warning::Turbopack reported a broken dev cache; clearing it for the next run."
+              clear_cache
+            fi
             exit "$status"
           }
           trap finish EXIT
+          # The apps boot while the runner installs Electron's libraries and bundles the shell.
+          sudo apt-get update -q
+          sudo apt-get install -yq xvfb libgtk-3-0t64 libnss3 libasound2t64 libgbm1 libxss1 \
+            libxtst6 libatk-bridge2.0-0t64 libxkbcommon0 > /dev/null
+          # Bundle only: `bun run build` also fetches the macOS node-pty prebuilds for packaging,
+          # which a Linux run does not use.
+          (cd apps/desktop && bun run scripts/build.ts)
           started=$SECONDS
+          retried=0
           until curl --fail --silent --max-time 10 http://127.0.0.1:3021/api/health > /dev/null &&
             curl --fail --silent --max-time 10 http://127.0.0.1:3023/health > /dev/null; do
-            kill -0 "$server_pid" 2>/dev/null || { tail -n 200 "$report_dir/desktop-tools-next.log"; exit 1; }
+            if ! kill -0 "$server_pid" 2>/dev/null; then
+              tail -n 200 "$next_log"
+              if [ "$retried" = 0 ] && cache_broken; then
+                echo "::warning::Turbopack rejected the restored dev cache; restarting from an empty cache."
+                bash "$GITHUB_WORKSPACE/.github/scripts/stop-session.sh" "$server_pid" "$server_tag"
+                clear_cache
+                : > "$next_log"
+                retried=1
+                start_sim
+                continue
+              fi
+              exit 1
+            fi
             kill -0 "$realtime_pid" 2>/dev/null || { tail -n 200 "$report_dir/desktop-tools-realtime.log"; exit 1; }
             [ $((SECONDS - started)) -lt "$READY_TIMEOUT_SECONDS" ] || { echo '::error::Local app did not become ready'; exit 1; }
             sleep 2
           done
+          echo "Local apps ready $((SECONDS - started))s after the Electron bundle"
           cd apps/desktop
           SIM_DESKTOP_E2E_SIM_URL=http://127.0.0.1:3021 \
           SIM_DESKTOP_E2E_PROXY_PORT=3020 \
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index be203bb1059..5f693d4e625 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,13 +18,11 @@ name: ci
 on:
   push:
     branches: [main, staging, dev]
+  # No path filter: `checks / ci` is the required status check, and a pull request whose run
+  # never starts never reports it, so it could not merge. Docs-only pull requests are rare enough
+  # that running CI on them costs nothing measurable.
   pull_request:
     branches: [main, staging, dev]
-    # Docs content and markdown don't affect the app build or images; push
-    # runs stay unfiltered because they feed the deploy pipeline.
-    paths-ignore:
-      - 'apps/docs/content/**'
-      - '**/*.md'
 
 concurrency:
   group: ci-${{ github.ref }}
diff --git a/scripts/update-integration-durations.ts b/scripts/update-integration-durations.ts
new file mode 100644
index 00000000000..32c9f876db9
--- /dev/null
+++ b/scripts/update-integration-durations.ts
@@ -0,0 +1,79 @@
+#!/usr/bin/env bun
+/**
+ * Rewrites `vitest.integration-durations.json`, the per-file weights the integration shards are
+ * balanced by (`DurationBalancedSequencer` in `vitest.shared.ts`), from a CI run's integration reports.
+ *
+ *   gh run download <run-id> -p 'integration-reports-*' -D /tmp/integration-reports
+ *   bun run scripts/update-integration-durations.ts /tmp/integration-reports
+ *
+ * A file's weight is its wall time including the import and collection that precede its first
+ * test (the gap since the previous file in the same shard ended), averaged across the push and
+ * migrate provisioning runs. apps/sim runs its files one at a time, so those gaps are real shard
+ * time; where files overlap, a file counts only its own time. Weights only steer balance; a stale
+ * file never changes what runs.
+ */
+import { readdir, readFile, writeFile } from 'node:fs/promises'
+import path from 'node:path'
+import { createLogger } from '@sim/logger'
+
+interface JsonReport {
+  testResults: { name: string; startTime: number; endTime: number }[]
+}
+
+const logger = createLogger('UpdateIntegrationDurations')
+const REPORT_NAME = 'integration.json'
+const ROOT = path.resolve(import.meta.dir, '..')
+const OUTPUT = path.join(ROOT, 'vitest.integration-durations.json')
+
+async function findReports(dir: string): Promise<string[]> {
+  const entries = await readdir(dir, { withFileTypes: true, recursive: true })
+  return entries
+    .filter((entry) => entry.isFile() && entry.name === REPORT_NAME)
+    .map((entry) => path.join(entry.parentPath, entry.name))
+}
+
+/** `/home/runner/_work/sim/sim/apps/sim/lib/x.integration.ts` → `apps/sim/lib/x.integration.ts` */
+function repoPath(absolute: string): string | null {
+  const match = absolute.match(/\/((?:apps|packages)\/.+)$/)
+  return match ? match[1] : null
+}
+
+const source = process.argv[2]
+if (!source) {
+  logger.error('Usage: bun run scripts/update-integration-durations.ts <downloaded-reports-dir>')
+  process.exit(1)
+}
+
+const samples = new Map<string, number[]>()
+const reports = await findReports(path.resolve(source))
+for (const reportPath of reports) {
+  const report = JSON.parse(await readFile(reportPath, 'utf8')) as JsonReport
+  const files = [...report.testResults].sort((a, b) => a.startTime - b.startTime)
+  let previousEnd = Number.NEGATIVE_INFINITY
+  for (const file of files) {
+    const key = repoPath(file.name)
+    // The gap before a file is its import time only when nothing else was running: in a run
+    // with file parallelism (packages/db) files overlap, and a file then counts its own time.
+    const start =
+      previousEnd > Number.NEGATIVE_INFINITY && previousEnd <= file.startTime
+        ? previousEnd
+        : file.startTime
+    if (key) samples.set(key, [...(samples.get(key) ?? []), (file.endTime - start) / 1000])
+    previousEnd = Math.max(previousEnd, file.endTime)
+  }
+}
+
+if (samples.size === 0) {
+  logger.error(`No ${REPORT_NAME} reports with test results under ${source}`)
+  process.exit(1)
+}
+
+const durations = Object.fromEntries(
+  [...samples.keys()].sort().map((key) => {
+    const values = samples.get(key) ?? []
+    const mean = values.reduce((sum, value) => sum + value, 0) / values.length
+    return [key, Math.round(mean * 10) / 10]
+  })
+)
+await writeFile(OUTPUT, `${JSON.stringify(durations, null, 2)}\n`)
+logger.info(`Wrote ${samples.size} file weights from ${reports.length} reports to ${OUTPUT}`)
diff --git a/vitest.integration-durations.json b/vitest.integration-durations.json
new file mode 100644
index 00000000000..a4770d55a6c
--- /dev/null
+++ b/vitest.integration-durations.json
@@ -0,0 +1,185 @@
+{
+  "apps/sim/app/api/auth/oauth2/token/route.integration.ts": 3.9,
+  "apps/sim/app/api/billing/update-cost/route.integration.ts": 2.7,
+  "apps/sim/app/api/copilot/chat/stream/desktop-executor.integration.ts": 6.8,
+  "apps/sim/app/api/knowledge/connectors/member-sync/route.integration.ts": 1.8,
+  "apps/sim/app/api/v1/knowledge/route.integration.ts": 2.6,
+  "apps/sim/background/cleanup-table-row-ttl-predicate.integration.ts": 0.5,
+  "apps/sim/background/cleanup-table-row-ttl.integration.ts": 5.7,
+  "apps/sim/ee/access-requests/lib/application/flow.integration.ts": 1.1,
+  "apps/sim/ee/access-requests/lib/impact.integration.ts": 0.8,
+  "apps/sim/ee/access-requests/lib/repository.integration.ts": 0.4,
+  "apps/sim/ee/scim/lib/managed-membership.integration.ts": 0.6,
+  "apps/sim/ee/workspace-forking/application/revision.integration.ts": 2,
+  "apps/sim/ee/workspace-forking/lib/lineage/fork-lock-order.integration.ts": 1.7,
+  "apps/sim/executor/handlers/agent/memory-harness.integration.ts": 6.9,
+  "apps/sim/lib/auth/oauth-provider-lifecycle.integration.ts": 3.1,
+  "apps/sim/lib/auth/oauth-token-family.integration.ts": 1,
+  "apps/sim/lib/auth/sim-auth-adapter.integration.ts": 0.7,
+  "apps/sim/lib/auth/sso/application/admit-sso-user.integration.ts": 0.5,
+  "apps/sim/lib/auth/sso/primary-provider.integration.ts": 1.8,
+  "apps/sim/lib/billing/calculations/usage-reservation.integration.ts": 0.3,
+  "apps/sim/lib/billing/core/organization-activity.integration.ts": 0.8,
+  "apps/sim/lib/billing/core/organization-usage-pagination.integration.ts": 0.6,
+  "apps/sim/lib/billing/core/plan.integration.ts": 0.5,
+  "apps/sim/lib/billing/core/reporting-usage-cache.integration.ts": 0.9,
+  "apps/sim/lib/billing/core/usage-analytics-queries.integration.ts": 0.6,
+  "apps/sim/lib/billing/core/usage-log.integration.ts": 15.7,
+  "apps/sim/lib/billing/core/usage-threshold-email.integration.ts": 0.5,
+  "apps/sim/lib/billing/organizations/member-limits.integration.ts": 0.9,
+  "apps/sim/lib/core/async-jobs/backends/trigger-dev.integration.ts": 0.7,
+  "apps/sim/lib/core/outbox/retention.integration.ts": 0.5,
+  "apps/sim/lib/core/outbox/service.integration.ts": 7.2,
+  "apps/sim/lib/core/rate-limiter/provider-capacity.integration.ts": 0.8,
+  "apps/sim/lib/credential-groups/__integration__/hubspot-mcp.integration.ts": 2.4,
+  "apps/sim/lib/credential-groups/__integration__/organization-account-outbound.integration.ts": 1.4,
+  "apps/sim/lib/dashboards/repository.integration.ts": 0.4,
+  "apps/sim/lib/db/advisory-locks.integration.ts": 0.7,
+  "apps/sim/lib/desktop/application/activity.integration.ts": 0.8,
+  "apps/sim/lib/desktop/application/executor.integration.ts": 1.8,
+  "apps/sim/lib/desktop/application/import.integration.ts": 0.9,
+  "apps/sim/lib/desktop/executor/bound-turn.integration.ts": 85.6,
+  "apps/sim/lib/desktop/executor/desktop-call-classifier.integration.ts": 0.5,
+  "apps/sim/lib/desktop/source-request.integration.ts": 1.7,
+  "apps/sim/lib/environment/execution-environment.integration.ts": 0.6,
+  "apps/sim/lib/execution/remote-sandbox/session-file-provenance.integration.ts": 0.6,
+  "apps/sim/lib/execution/remote-sandbox/session-input-certification.integration.ts": 0.4,
+  "apps/sim/lib/knowledge/__integration__/application-acl.integration.ts": 3.9,
+  "apps/sim/lib/knowledge/__integration__/coda-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/confluence-identity.integration.ts": 2.1,
+  "apps/sim/lib/knowledge/__integration__/confluence-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/connector-deferral.integration.ts": 1.9,
+  "apps/sim/lib/knowledge/__integration__/connector-lease-pages.integration.ts": 25.3,
+  "apps/sim/lib/knowledge/__integration__/connector-lifecycle-locks.integration.ts": 2,
+  "apps/sim/lib/knowledge/__integration__/connector-partition-work.integration.ts": 1.7,
+  "apps/sim/lib/knowledge/__integration__/connector-permissions.integration.ts": 0.5,
+  "apps/sim/lib/knowledge/__integration__/connector-persistence-regressions.integration.ts": 3.7,
+  "apps/sim/lib/knowledge/__integration__/connector-save-concurrency.integration.ts": 2.3,
+  "apps/sim/lib/knowledge/__integration__/connector-upload.integration.ts": 1.6,
+  "apps/sim/lib/knowledge/__integration__/directory-sync.integration.ts": 2.3,
+  "apps/sim/lib/knowledge/__integration__/dormant-processing-recovery.integration.ts": 1.3,
+  "apps/sim/lib/knowledge/__integration__/dormant-search-processing.integration.ts": 1.6,
+  "apps/sim/lib/knowledge/__integration__/embedding-insert-batches.integration.ts": 1.4,
+  "apps/sim/lib/knowledge/__integration__/embedding-processing-recovery.integration.ts": 3.2,
+  "apps/sim/lib/knowledge/__integration__/execution-archive-provenance.integration.ts": 4.1,
+  "apps/sim/lib/knowledge/__integration__/external-file-provenance.integration.ts": 2,
+  "apps/sim/lib/knowledge/__integration__/filtered-search.integration.ts": 1.9,
+  "apps/sim/lib/knowledge/__integration__/gitlab-federated.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/gitlab-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/gitlab-workspace.integration.ts": 3.9,
+  "apps/sim/lib/knowledge/__integration__/google-drive-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/google-drive-member-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/google-drive-shortcuts.integration.ts": 3,
+  "apps/sim/lib/knowledge/__integration__/kb-block-search.integration.ts": 0.9,
+  "apps/sim/lib/knowledge/__integration__/knowledge-base-deletion.integration.ts": 0.8,
+  "apps/sim/lib/knowledge/__integration__/knowledge-base-list.integration.ts": 2.6,
+  "apps/sim/lib/knowledge/__integration__/knowledge-projection.integration.ts": 0.9,
+  "apps/sim/lib/knowledge/__integration__/listing-continuation.integration.ts": 26.1,
+  "apps/sim/lib/knowledge/__integration__/member-document-lifecycle.integration.ts": 8.6,
+  "apps/sim/lib/knowledge/__integration__/member-scope-renewal.integration.ts": 1.6,
+  "apps/sim/lib/knowledge/__integration__/ocr-input-failures.integration.ts": 1.7,
+  "apps/sim/lib/knowledge/__integration__/processing-lock-scope.integration.ts": 1.5,
+  "apps/sim/lib/knowledge/__integration__/provider-admission.integration.ts": 0.8,
+  "apps/sim/lib/knowledge/__integration__/provider-processing-recovery.integration.ts": 2.2,
+  "apps/sim/lib/knowledge/__integration__/providers-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/purged-detach-reservation.integration.ts": 5,
+  "apps/sim/lib/knowledge/__integration__/reranker-admission.integration.ts": 0.7,
+  "apps/sim/lib/knowledge/__integration__/scale.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/search-index-policy.integration.ts": 1.6,
+  "apps/sim/lib/knowledge/__integration__/search-latency.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/search-mcp-setup.integration.ts": 5.4,
+  "apps/sim/lib/knowledge/__integration__/search-reference-batching.integration.ts": 0.6,
+  "apps/sim/lib/knowledge/__integration__/search-source-pagination.integration.ts": 1.4,
+  "apps/sim/lib/knowledge/__integration__/search-source-progress.integration.ts": 3,
+  "apps/sim/lib/knowledge/__integration__/search-source-setup.integration.ts": 3,
+  "apps/sim/lib/knowledge/__integration__/slack-empty-threads.integration.ts": 2.1,
+  "apps/sim/lib/knowledge/__integration__/slack-live.integration.ts": 0,
+  "apps/sim/lib/knowledge/__integration__/slack-search-turns.integration.ts": 2.1,
+  "apps/sim/lib/knowledge/__integration__/storage-accounting.integration.ts": 3.1,
+  "apps/sim/lib/knowledge/__integration__/storage-cleanup.integration.ts": 1.6,
+  "apps/sim/lib/knowledge/__integration__/stored-document-recovery.integration.ts": 5.1,
+  "apps/sim/lib/knowledge/__integration__/upload-read-provenance.integration.ts": 1.3,
+  "apps/sim/lib/knowledge/__integration__/user-document-visibility.integration.ts": 0.5,
+  "apps/sim/lib/knowledge/__integration__/workspace-import.integration.ts": 1.8,
+  "apps/sim/lib/knowledge/__integration__/workspace-kb-document-access.integration.ts": 1.2,
+  "apps/sim/lib/knowledge/__integration__/workspace-lifecycle.integration.ts": 2.9,
+  "apps/sim/lib/knowledge/access/group-membership.integration.ts": 0.5,
+  "apps/sim/lib/knowledge/access/predicate.integration.ts": 16.5,
+  "apps/sim/lib/knowledge/application/github-installations.integration.ts": 0.8,
+  "apps/sim/lib/knowledge/application/search-index.integration.ts": 0.5,
+  "apps/sim/lib/knowledge/application/slack-search/assistant.integration.ts": 0.8,
+  "apps/sim/lib/knowledge/connectors/external-directory.integration.ts": 0.2,
+  "apps/sim/lib/knowledge/connectors/sync-content-pass.integration.ts": 1,
+  "apps/sim/lib/knowledge/connectors/sync-persistence.integration.ts": 0.6,
+  "apps/sim/lib/knowledge/search/history/history.integration.ts": 0.6,
+  "apps/sim/lib/knowledge/tags/date-tag-condition.integration.ts": 0.9,
+  "apps/sim/lib/logs/execution/completion-ledger-order.integration.ts": 2.6,
+  "apps/sim/lib/logs/execution/start-execution.integration.ts": 1.8,
+  "apps/sim/lib/memory/conversation-store.integration.ts": 2.8,
+  "apps/sim/lib/memory/message-provenance.integration.ts": 2.1,
+  "apps/sim/lib/memory/summary-store.integration.ts": 0.8,
+  "apps/sim/lib/mothership/agent-cli/workbench-file-provenance.integration.ts": 1.3,
+  "apps/sim/lib/mothership/async-runs/browser-download-claim.integration.ts": 0.6,
+  "apps/sim/lib/mothership/async-runs/orphaned-runs.integration.ts": 29.1,
+  "apps/sim/lib/mothership/async-runs/tool-identity.integration.ts": 3.2,
+  "apps/sim/lib/mothership/billing/service-store.integration.ts": 0.7,
+  "apps/sim/lib/mothership/chat/application/set-effort.integration.ts": 0.8,
+  "apps/sim/lib/mothership/chat/chat-mcp-servers.integration.ts": 0.6,
+  "apps/sim/lib/mothership/request/session/buffer-ttl.integration.ts": 12.3,
+  "apps/sim/lib/mothership/request/session/recovery-storm.integration.ts": 217.3,
+  "apps/sim/lib/mothership/request/session/replay-budget.integration.ts": 39,
+  "apps/sim/lib/mothership/request/session/replay-gap.integration.ts": 62.2,
+  "apps/sim/lib/mothership/request/session/stream-recovery.integration.ts": 6.9,
+  "apps/sim/lib/mothership/request/tools/workflow-client-settlement.integration.ts": 1,
+  "apps/sim/lib/mothership/tasks/application/prepare-wake.integration.ts": 12.3,
+  "apps/sim/lib/mothership/tools/client/desktop-tool-authorization.integration.ts": 6.8,
+  "apps/sim/lib/mothership/tools/client/desktop-tool-chat-view-lease.integration.ts": 6.9,
+  "apps/sim/lib/mothership/tools/client/desktop-tool-executor.integration.ts": 4.8,
+  "apps/sim/lib/mothership/tools/client/desktop-tool-pickup.integration.ts": 87.1,
+  "apps/sim/lib/projects/__integration__/foundation.integration.ts": 14.3,
+  "apps/sim/lib/selectors/__integration__/copilot-nested-selectors.integration.ts": 4.3,
+  "apps/sim/lib/sim-search/live/managed-mcp.integration.ts": 8.3,
+  "apps/sim/lib/sim-search/live/provider-discovery.integration.ts": 1.3,
+  "apps/sim/lib/table/analytics/postgres.integration.ts": 0.7,
+  "apps/sim/lib/table/row-changes.integration.ts": 0.8,
+  "apps/sim/lib/table/rows/row-writes.integration.ts": 12.5,
+  "apps/sim/lib/table/rows/secret-provenance.integration.ts": 1.9,
+  "apps/sim/lib/uploads/contexts/organization-logo/application.integration.ts": 0.8,
+  "apps/sim/lib/uploads/contexts/workspace/__integration__/file-names.integration.ts": 2.1,
+  "apps/sim/lib/uploads/contexts/workspace/__integration__/file-versions.integration.ts": 9.1,
+  "apps/sim/lib/uploads/upload-session/workspace-file-provenance.integration.ts": 0.6,
+  "apps/sim/lib/webhooks/registration-store.integration.ts": 0.9,
+  "apps/sim/lib/webhooks/trigger-block-deployment.integration.ts": 7.4,
+  "apps/sim/lib/workflows/application/compare-workflow-versions.integration.ts": 2.5,
+  "apps/sim/lib/workflows/application/read-workflow-version.integration.ts": 2.4,
+  "apps/sim/lib/workflows/custom-blocks/workspace-rows.integration.ts": 1.1,
+  "apps/sim/lib/workflows/executor/pause-persistence.integration.ts": 5.9,
+  "apps/sim/lib/workflows/orchestration/create-workflow-with-state.integration.ts": 3.1,
+  "apps/sim/lib/workspace-files/search/chunks.integration.ts": 13.9,
+  "apps/sim/lib/workspace-files/search/dispatcher.integration.ts": 14.5,
+  "apps/sim/lib/workspace-files/search/index-plan.integration.ts": 0.2,
+  "apps/sim/lib/workspaces/__integration__/fork-sync.integration.ts": 25,
+  "apps/sim/lib/workspaces/__integration__/http-cli.integration.ts": 8.6,
+  "apps/sim/lib/workspaces/__integration__/mapped-import.integration.ts": 6,
+  "apps/sim/lib/workspaces/__integration__/pagination.integration.ts": 0.8,
+  "apps/sim/lib/workspaces/__integration__/receipts.integration.ts": 0.6,
+  "apps/sim/lib/workspaces/organization-workspaces.integration.ts": 0.8,
+  "apps/sim/tools/powerbi/powerbi.integration.ts": 8.4,
+  "packages/db/embedding-width-migration.integration.ts": 0.4,
+  "packages/db/maintenance/search-retirement.integration.ts": 12,
+  "packages/db/member-sync-status-migration.integration.ts": 0,
+  "packages/db/organization-search-migration.integration.ts": 1.2,
+  "packages/db/permission-access-requests-migration.integration.ts": 0.1,
+  "packages/db/script-migrations/0013_backfill_legacy_knowledge_base_workspaces.integration.ts": 6,
+  "packages/db/script-migrations/0014_require_knowledge_base_owner.integration.ts": 0.2,
+  "packages/db/script-migrations/0016_backfill_search_vectors.integration.ts": 8,
+  "packages/db/script-migrations/0018_repair_workspace_file_content_revision.integration.ts": 0.1,
+  "packages/db/script-migrations/0019_tin_keyword_projection.integration.ts": 0.2,
+  "packages/db/script-migrations/0021_embedding_search_connector.integration.ts": 0.2,
+  "packages/db/script-migrations/0025_scope_keyword_projections.integration.ts": 0.4,
+  "packages/db/script-migrations/0027_retire_search_embeddings.integration.ts": 20.6,
+  "packages/db/scripts/connector-sync-schedule-precision.integration.ts": 0,
+  "packages/db/scripts/database-failure-classification.integration.ts": 1.1,
+  "packages/db/scripts/push.integration.ts": 7,
+  "packages/db/scripts/retired-columns.integration.ts": 0.3
+}
diff --git a/vitest.shared.ts b/vitest.shared.ts
index 31cdcdfd1e5..f5c24a401f9 100644
--- a/vitest.shared.ts
+++ b/vitest.shared.ts
@@ -1,4 +1,7 @@
+import { existsSync, readFileSync } from 'node:fs'
+import path from 'node:path'
 import { configDefaults, defineConfig } from 'vitest/config'
+import { BaseSequencer, type TestSpecification } from 'vitest/node'
 
 /**
  * The one Vitest base every workspace config extends with `mergeConfig`.
@@ -22,6 +25,80 @@ export default defineConfig({
   },
 })
 
+/** Seconds a file of unknown duration is assumed to take: about the median measured file. */
+const UNKNOWN_FILE_SECONDS = 6
+/** Floor for any file: one that skips every test in CI still pays its import and collection. */
+const MIN_FILE_SECONDS = 1
+const DURATIONS_FILE = 'vitest.integration-durations.json'
+
+/**
+ * The committed weights, or none when the file is absent. A file that does not parse stops the run
+ * with the fix in the message rather than a bare SyntaxError.
+ */
+function readDurations(file: string): Record<string, unknown> {
+  if (!existsSync(file)) return {}
+  try {
+    return JSON.parse(readFileSync(file, 'utf8'))
+  } catch (error) {
+    throw new Error(
+      `${DURATIONS_FILE} is not valid JSON. Regenerate it with scripts/update-integration-durations.ts.`,
+      { cause: error }
+    )
+  }
+}
+
+function findRepoRoot(from: string): string {
+  let dir = from
+  while (!existsSync(path.join(dir, 'bun.lock'))) {
+    const parent = path.dirname(dir)
+    if (parent === dir) throw new Error(`No bun.lock above ${from}`)
+    dir = parent
+  }
+  return dir
+}
+
+/**
+ * Splits `--shard` runs by measured duration instead of by file count.
+ *
+ * Vitest's own shard() sorts files by path hash and hands each shard an equal number of them, so
+ * one long suite can land beside dozens of others and set the slowest shard. This packs files
+ * greedily, longest first, into the currently lightest shard, using the per-file seconds committed
+ * in `vitest.integration-durations.json` (refreshed by `scripts/update-integration-durations.ts`).
+ *
+ * Every shard computes the full partition from the same file list and the same committed weights,
+ * with ties broken by path and then by lowest shard index, so the shards are disjoint and together
+ * cover every file. A stale or missing weight only costs balance, never coverage. Ordering within a
+ * shard is Vitest's own sort().
+ */
+class DurationBalancedSequencer extends BaseSequencer {
+  override async shard(files: TestSpecification[]): Promise<TestSpecification[]> {
+    const { index, count } = this.ctx.config.shard ?? { index: 1, count: 1 }
+    const root = findRepoRoot(this.ctx.config.root)
+    const durations = readDurations(path.join(root, DURATIONS_FILE))
+
+    const weighted = files.map((spec) => {
+      const key = path.relative(root, spec.moduleId).split(path.sep).join('/')
+      const recorded = durations[key]
+      const seconds =
+        typeof recorded === 'number' && Number.isFinite(recorded) ? recorded : UNKNOWN_FILE_SECONDS
+      return { spec, key, seconds: Math.max(seconds, MIN_FILE_SECONDS) }
+    })
+    weighted.sort((a, b) => b.seconds - a.seconds || (a.key < b.key ? -1 : a.key > b.key ? 1 : 0))
+
+    const loads = new Array<number>(count).fill(0)
+    const shards = Array.from({ length: count }, () => [] as TestSpecification[])
+    for (const { spec, seconds } of weighted) {
+      let lightest = 0
+      for (let shard = 1; shard < count; shard++) {
+        if (loads[shard] < loads[lightest]) lightest = shard
+      }
+      loads[lightest] += seconds
+      shards[lightest].push(spec)
+    }
+    return shards[index - 1]
+  }
+}
+
 /**
  * Overrides for a workspace's `--mode integration` run against real PostgreSQL and Redis.
  *
@@ -38,5 +115,6 @@ export const integrationTestConfig = defineConfig({
     hookTimeout: 30_000,
     reporters: ['default', 'json'],
     outputFile: { json: process.env.INTEGRATION_REPORT_PATH ?? 'test-results/integration.json' },
+    sequence: { sequencer: DurationBalancedSequencer },
   },
 })