Revert "uses shard to get the perf report"

This reverts commit f8f7b45.

.github/workflows/perf-tests.yml

@@ -9,10 +9,6 @@ jobs:
   performance-tests:
     name: 'Performance Tests'
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        shard: [ 1/4, 2/4, 3/4, 4/4 ]
     env:
       WP_BASE_URL: 'http://localhost:8888'
       WP_USERNAME: 'admin'
@@ -55,45 +51,49 @@ jobs:
 
       - name: Run tests
         run: |
-          yarn test:performance --shard ${{ matrix.shard }}
+          yarn test:performance
+          mv ${{ env.WP_ARTIFACTS_PATH }}/performance-results.json ${{ runner.temp }}/results_after.json
 
-      - name: Upload blob report to GitHub Actions Artifacts
-        if: always()
-        uses: actions/upload-artifact@v4
-        with:
-          name: all-blob-reports
-          path: blob-report
-          retention-days: 1
-
-  merge-reports:
-    # Merge reports after playwright-tests, even if some shards have failed
-    if: always()
-    needs: [ performance-tests ]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version-file: '.nvmrc'
-          cache: yarn
+      - name: Check out base commit
+        run: |
+          if [[ -z "$BASE_REF" ]]; then
+            git fetch -n origin $BASE_SHA
+            git reset --hard $BASE_SHA
+          else
+            git fetch -n origin $BASE_REF
+            git reset --hard $BASE_SHA
+          fi
+        env:
+          BASE_REF: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref || '' }}
+          BASE_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
+
+      # Run tests without causing job to fail if they don't pass (e.g. because of env issues).
+      - name: Run tests for base
+        run: |
+          npm run test:performance || true
+          if [ -f "{{ env.WP_ARTIFACTS_PATH }}/performance-results.json" ]; then
+            mv ${{ env.WP_ARTIFACTS_PATH }}/performance-results.json ${{ runner.temp }}/results_before.json
+          fi;
 
-      - name: Install dependencies
-        run: yarn install --immutable
+      - name: Reset to original commit
+        run: |
+          git reset --hard $GITHUB_SHA
 
-      - name: Download blob reports from GitHub Actions Artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: all-blob-reports
-          path: all-blob-reports
+      - name: Compare results with base
+        run: |
+          if [ -f "${{ runner.temp }}/results_before.json" ]; then
+            yarn test:performance:results ${{ runner.temp }}/results_after.json ${{ runner.temp }}/results_before.json
+          else
+            yarn test:performance:results ${{ runner.temp }}/results_after.json
+          fi;
 
-      - name: Merge into single performance report
-        run: yarn test:performance:merge-reports
+      - name: Add workflow summary
+        run: |
+          cat ${{ env.WP_ARTIFACTS_PATH }}/performance-results.md >> $GITHUB_STEP_SUMMARY
 
-      - name: Upload performance report
+      - name: Upload performance results
+        if: success()
         uses: actions/upload-artifact@v4
         with:
-          name: performance-report-${{ github.run_attempt }}
-          path: artifacts/performance-results.json
-          retention-days: 14
+          name: performance-results
+          path: ${{ env.WP_ARTIFACTS_PATH }}/performance-results.json

tests/performance/playwright.config.ts

@@ -13,7 +13,7 @@ process.env.STORAGE_STATE_PATH ??= join(
 	process.env.WP_ARTIFACTS_PATH,
 	authStoragePath
 );
-process.env.TEST_ITERATIONS ??= '20';
+process.env.TEST_ITERATIONS ??= '4';
 
 const config = defineConfig({
 	globalSetup: require.resolve('../e2e/global-setup.ts'),