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Run performance and Core Web Vitals testing on a URL. Use when user wants to test page speed, LCP, CLS, INP, load times, asset optimization, or runtime performance.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Master index for all UI testing skills. Lists available test suites and their coverage.
Run comprehensive WCAG 2.1 AA+ accessibility tests on a URL. Use when user wants to test accessibility, a11y compliance, screen reader support, or keyboard navigation.
Run the complete UI testing suite — all 15 test skills across functional testing and UX design quality. Use when user wants a comprehensive site audit, full test suite, or complete quality assessment.
Audit design system consistency across pages. Use when user wants to check visual consistency, design tokens, component reuse, color palette, typography, spacing, or cross-page uniformity.
Analyze conversion optimization, cognitive load, and trust signals. Use when user wants to audit conversion funnels, reduce friction, analyze cognitive load, check trust signals, or optimize CTAs.
Test cross-browser consistency across Chromium, Firefox, and WebKit. Use when user wants to verify browser compatibility, cross-browser layout, or browser-specific issues.
| name | test-perf |
| description | Run performance and Core Web Vitals testing on a URL. Use when user wants to test page speed, LCP, CLS, INP, load times, asset optimization, or runtime performance. |
| allowed-tools | Bash(playwright-cli:*) Bash(npx:*) Bash(mkdir:*) |
Run 25 performance test cases across 3 parallel agents covering page load/CWV, runtime performance, and asset optimization.
URL="${ARGUMENTS:-http://localhost:3000}"
TIMESTAMP=$(date +%Y%m%d-%H%M%S)
OUTDIR="test-results/test-perf/$TIMESTAMP"
mkdir -p "$OUTDIR/screenshots" "$OUTDIR/snapshots" "$OUTDIR/traces"
-s=perf-loading)Tests page load performance and Core Web Vitals.
playwright-cli -s=perf-loading open "$URL"
playwright-cli -s=perf-loading tracing-start
Test Cases:
| TC | Test | How to Check |
|---|---|---|
| TC-P1 | Time to first meaningful paint | run-code to read performance.getEntriesByType('paint') for first-contentful-paint timing |
| TC-P2 | LCP ≤2.5s | run-code with PerformanceObserver for largest-contentful-paint entry, check startTime ≤ 2500 |
| TC-P3 | FID/INP ≤200ms | run-code with PerformanceObserver for first-input and event entries, check delay ≤ 200ms |
| TC-P4 | CLS ≤0.1 | run-code with PerformanceObserver for layout-shift entries (no hadRecentInput), sum values, check ≤ 0.1 |
| TC-P5 | Time to Interactive (TTI) | run-code to measure time until main thread is idle: performance.timing.domInteractive - performance.timing.navigationStart |
| TC-P6 | Total page weight <3MB | run-code to sum performance.getEntriesByType('resource').map(r => r.transferSize), check < 3MB |
| TC-P7 | DOM node count <1500 | run-code: document.querySelectorAll('*').length, flag if >1500 |
| TC-P8 | Render-blocking resources count | run-code to find <link rel="stylesheet"> in <head> without media attr and <script> without defer/async |
playwright-cli -s=perf-loading tracing-stop
playwright-cli -s=perf-loading close
-s=perf-runtime)Tests runtime performance and interaction responsiveness.
playwright-cli -s=perf-runtime open "$URL"
playwright-cli -s=perf-runtime tracing-start
Test Cases:
| TC | Test | How to Check |
|---|---|---|
| TC-P9 | Long tasks (>50ms) detected | run-code with PerformanceObserver for longtask entries, report count and durations |
| TC-P10 | Memory usage / leaks | run-code: performance.memory (Chrome only) — check usedJSHeapSize, compare before/after interactions |
| TC-P11 | Scroll performance (no jank) | run-code to scroll page while measuring frame timing via requestAnimationFrame, flag >16ms gaps |
| TC-P12 | Animation frame rate | run-code to measure 60 frames via requestAnimationFrame, calculate avg fps, flag <30fps |
| TC-P13 | Input responsiveness | run-code to measure time from click event to next paint via PerformanceObserver event entries |
| TC-P14 | Lazy loading works | run-code to check images below fold have loading="lazy" and aren't loaded until scroll |
| TC-P15 | Skeleton/loading states appear before content | run-code to intercept network requests, verify skeleton UI renders while data loads |
playwright-cli -s=perf-runtime tracing-stop
playwright-cli -s=perf-runtime close
-s=perf-assets)Tests asset optimization and network efficiency.
playwright-cli -s=perf-assets open "$URL"
playwright-cli -s=perf-assets tracing-start
Test Cases:
| TC | Test | How to Check |
|---|---|---|
| TC-P16 | Images use modern formats (WebP/AVIF) | run-code to check image src extensions and Content-Type from performance entries |
| TC-P17 | Images have explicit width/height | run-code to find <img> elements without width and height attributes (causes CLS) |
| TC-P18 | Images lazy loaded | run-code to find below-fold images, check for loading="lazy" attribute |
| TC-P19 | CSS/JS minified | run-code to fetch CSS/JS resources, check file size and whitespace ratio |
| TC-P20 | Gzip/Brotli compression enabled | run-code to check Content-Encoding header on resources via performance entries |
| TC-P21 | Browser caching headers | run-code to fetch resources and check Cache-Control, ETag, Expires headers |
| TC-P22 | No unused CSS/JS (coverage) | run-code with page.coverage.startCSSCoverage() / startJSCoverage(), report unused percentage |
| TC-P23 | Font loading strategy | run-code to check @font-face rules for font-display: swap or optional |
| TC-P24 | Preconnect/prefetch hints | run-code to find <link rel="preconnect/prefetch/preload"> for third-party origins |
| TC-P25 | HTTP/2 or HTTP/3 used | run-code to check nextHopProtocol from performance.getEntriesByType('resource') |
playwright-cli -s=perf-assets tracing-stop
playwright-cli -s=perf-assets close
After all 3 agents complete, merge results into $OUTDIR/report.md.
Include a performance scorecard:
| Metric | Value | Target | Status |
|---|---|---|---|
| LCP | Xs | ≤2.5s | ✅/❌ |
| CLS | X | ≤0.1 | ✅/❌ |
| INP | Xms | ≤200ms | ✅/❌ |
| Page Weight | XMB | <3MB | ✅/❌ |
| DOM Nodes | X | <1500 | ✅/❌ |
Group detailed results:
playwright-cli -s=perf-loading close 2>/dev/null
playwright-cli -s=perf-runtime close 2>/dev/null
playwright-cli -s=perf-assets close 2>/dev/null