perf

Installation
SKILL.md

Perf — Performance Optimization v3.0

Measure, analyze, and optimize performance.

Actions

/perf audit <url>

Run Lighthouse via /browser-test and extract performance metrics:

  • LCP (Largest Contentful Paint) — target < 2.5s
  • FID (First Input Delay) — target < 100ms
  • CLS (Cumulative Layout Shift) — target < 0.1
  • TTFB (Time to First Byte) — target < 800ms

/perf bundle <path>

Analyze JavaScript bundle size:

  • Total bundle size
  • Per-chunk breakdown
  • Tree-shaking opportunities
  • Duplicate dependencies

/perf track

Compare current metrics against previous run:

  • Store results in .claude/quality-results/perf/
  • Show delta (improved/regressed)
  • Flag regressions as ADVISORY

Integration

  • /browser-test provides raw Lighthouse data
  • /gates Stage 5 (BROWSER) includes perf checks
  • /ship checklist includes perf audit

Reference Checklist

See: docs/reference/performance-checklist.md (created with this skill)

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