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## Summary Add a permanent, non-failing performance regression detection system using Chrome DevTools Protocol metrics, with automatic PR commenting. ## Changes - **What**: Performance testing infrastructure — `PerformanceHelper` fixture class using CDP `Performance.getMetrics` to collect `RecalcStyleCount`, `LayoutCount`, `LayoutDuration`, `TaskDuration`, `JSHeapUsedSize`. Adds `@perf` Playwright project (Chromium-only, single-threaded, 60s timeout), 4 baseline perf tests, CI workflow with sticky PR comment reporting, and `perf-report.js` script for generating markdown comparison tables. ## Review Focus - `PerformanceHelper` uses `page.context().newCDPSession(page)` — CDP is Chromium-only, so perf metrics are not collected on Firefox. This is intentional since CDP gives us browser-level style recalc/layout counts that `performance.mark/measure` cannot capture. - The CI workflow uses `continue-on-error: true` so perf tests never block merging. - Baseline comparison uses `dawidd6/action-download-artifact` to download metrics from the target branch, following the same pattern as `pr-size-report.yaml`. ## Stack This is the foundation PR for the Firefox performance fix stack: 1. **→ This PR: perf testing infrastructure** 2. `perf/fix-cursor-cache` — cursor style caching (depends on this) 3. `perf/fix-subgraph-svg` — SVG pre-rasterization (depends on this) 4. `perf/fix-clippath-raf` — RAF batching for clip-path (depends on this) PRs 2-4 are independent of each other. ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-9170-feat-add-performance-testing-infrastructure-with-CDP-metrics-3116d73d3650817cb43def6f8e9917f8) by [Unito](https://www.unito.io) --------- Co-authored-by: GitHub Action <action@github.com> Co-authored-by: Alexander Brown <drjkl@comfy.org>