chore(ci): shorten lighthouse pr validation

.github/actions/setup-ci/action.yml

@@ -5,6 +5,9 @@ inputs:
   install-playwright:
     description: Install Playwright browser and system dependencies.
     default: 'true'
+  playwright-ubuntu-mirror:
+    description: Use the Ubuntu archive for Playwright system packages.
+    default: 'false'
 
 runs:
   using: composite
@@ -51,6 +54,12 @@ runs:
       with:
         path: ~/.cache/ms-playwright
         key: ${{ runner.os }}-${{ runner.arch }}-playwright-chromium-shell-${{ steps.playwright-version.outputs.version }}-v1
+    - name: Select Ubuntu package mirror
+      if: inputs.install-playwright == 'true' && inputs.playwright-ubuntu-mirror == 'true'
+      shell: bash
+      run: |
+        test -f /etc/apt/apt-mirrors.txt
+        printf '%s\n' 'http://archive.ubuntu.com/ubuntu' | sudo tee /etc/apt/apt-mirrors.txt
     - name: Install Playwright system dependencies
       if: inputs.install-playwright == 'true'
       shell: bash

.github/workflows/ci.yml

@@ -9,6 +9,15 @@ on:
     - cron: '7 23 * * *' # 11:07 PM America/Chicago
       timezone: America/Chicago
   workflow_dispatch:
+    inputs:
+      performance-only:
+        description: Measure PR checks without publishing pages
+        type: boolean
+        default: false
+      ci-comparison-ref:
+        description: Optional baseline commit for paired cold CI profiles
+        type: string
+        default: ''
 
 permissions:
   contents: read
@@ -40,6 +49,7 @@ jobs:
       - name: Upload code coverage
         if: >-
           github.event_name == 'push' ||
+          inputs.performance-only ||
           (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository)
         uses: actions/upload-code-coverage@d8e329117199404bba6fc81efe8093dc7c015e34 # v1.4.2
         with:
@@ -89,7 +99,7 @@ jobs:
             projects/viewport/dist
             projects/viewport/package.json
       - name: Prepare IndexNow artifacts
-        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+        if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && !inputs.performance-only)
         env:
           ELEMENTS_PAGES_BASE_URL: ${{vars.ELEMENTS_PAGES_BASE_URL}}
           INDEXNOW_KEY: ${{secrets.INDEXNOW_KEY}}
@@ -98,13 +108,13 @@ jobs:
           --site-dir projects/pages/dist
           --site-url "$ELEMENTS_PAGES_BASE_URL"
       - name: Upload pages artifact
-        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+        if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && !inputs.performance-only)
         uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9
         with:
           path: projects/pages/dist
           include-hidden-files: true
       - name: Upload IndexNow state
-        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+        if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && !inputs.performance-only)
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
         with:
           name: indexnow-state
@@ -119,12 +129,71 @@ jobs:
         with:
           fetch-depth: 0
           lfs: true
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
       - uses: ./.github/actions/setup-ci
+        with:
+          playwright-ubuntu-mirror: 'true'
       - name: Run Lighthouse tests
-        run: WIREIT_FAILURES=kill pnpm run lighthouse && node ./projects/internals/ci/cache-validate.js lighthouse && node ./projects/internals/ci/metrics.lighthouse.js
+        run: >-
+          WIREIT_FAILURES=kill mise exec -- pnpm run ci:profile --target lighthouse --samples 1 --reset none
+          && mise exec -- node ./projects/internals/ci/cache-validate.js lighthouse
+          && mise exec -- node ./projects/internals/ci/metrics.lighthouse.js
       - name: Write lighthouse job summary
         if: always()
         run: node ./projects/internals/ci/lighthouse-summary.js >> "$GITHUB_STEP_SUMMARY"
+      - name: Upload Lighthouse measurements
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
+        with:
+          name: lighthouse-measurements
+          retention-days: 14
+          include-hidden-files: true
+          path: |
+            .metrics/ci-profile*
+            .metrics/metrics.lighthouse.txt
+            projects/*/.lighthouse/dist/report.json
+            projects/*/coverage/lighthouse/*
+            projects/site/coverage/unit/summary.json
+
+  ci-comparison:
+    if: github.event_name == 'workflow_dispatch' && inputs.ci-comparison-ref != ''
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - sample: 1
+            order: baseline-first
+          - sample: 2
+            order: candidate-first
+          - sample: 3
+            order: baseline-first
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
+        with:
+          fetch-depth: 0
+          lfs: true
+      - uses: ./.github/actions/setup-ci
+      - name: Compare cold CI on the same runner
+        env:
+          CI_BASELINE_REF: ${{ inputs.ci-comparison-ref }}
+          CI_COMPARE_ORDER: ${{ matrix.order }}
+          ELEMENTS_PAGES_BASE_URL: ${{ vars.ELEMENTS_PAGES_BASE_URL }}
+          ELEMENTS_REGISTRY_URL: ${{ vars.ELEMENTS_REGISTRY_URL }}
+          ELEMENTS_REPO_BASE_URL: ${{ vars.ELEMENTS_REPO_BASE_URL }}
+          GITHUB_TOKEN: ${{ github.token }}
+        run: >-
+          mise exec -- pnpm run ci:profile --target ci --samples 1 --reset cold
+          --compare-ref "$CI_BASELINE_REF" --order "$CI_COMPARE_ORDER"
+      - name: Upload paired CI profiles
+        if: always()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a
+        with:
+          name: ci-comparison-${{ matrix.sample }}
+          retention-days: 14
+          include-hidden-files: true
+          path: .metrics/ci-profile-comparison/
 
   release:
     needs: ci
@@ -210,7 +279,7 @@ jobs:
 
   deploy-pages:
     needs: ci
-    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
+    if: github.event_name == 'push' || (github.event_name == 'workflow_dispatch' && !inputs.performance-only)
     runs-on: ubuntu-latest
     permissions:
       actions: read

projects/core/vitest.lighthouse.ts

@@ -7,6 +7,7 @@ export default mergeConfig(libraryLighthouseTestConfig, {
     alias: { '@nvidia-elements/core': resolve(import.meta.dirname, './dist') }
   },
   test: {
+    maxWorkers: 4,
     include: ['src/**/*.test.lighthouse.ts'],
     outputFile: {
       junit: './coverage/lighthouse/junit.xml'