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performance-audit-websites

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Diagnose measured runtime and Core Web Vitals.

skills/performance-audit-websites/SKILL.md

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# Performance Audit Websites

Use this skill to keep premium sites fast enough that visual ambition does not punish users. Measure first and optimize the dominant constraint; do not apply framework folklore as proof.

Own measured diagnosis and implementation. Route pre-build numeric budgets, acceptance thresholds, and visual-richness policy to `$performance-budget-lab`.

## Workflow

1. Inspect the affected surface, relevant project scripts, target URL and available inspection tooling; reuse existing context.
2. Read [Performance Audit Websites Guide](references/performance-audit-websites-guide.md) before claiming the site is ready. For React or Next.js implementation work, also read [React and Next.js performance](references/react-next-performance.md).
3. Record a reproducible baseline and identify the dominant request, rendering, interaction or layout-shift cost. When optimization is authorized, change the measured bottleneck and compare under matched build/device/cache conditions.
4. Fix issues when they are in scope; otherwise record exact evidence and remaining risk.
5. Summarize commands, URLs, screenshots/checks, changed files, and what was not tested.
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