Audit website performance. Use for Core Web Vitals, LCP, INP, CLS, Lighthouse or browser performance checks, bundle and asset weight, image/video loading, font loading, third-party scripts, animation cost, hydration cost, and production-readiness performance review.
Installation
Installer avec Codex ou Claude Copiez ce prompt, collez-le dans Codex, Claude ou un autre assistant, puis laissez-le vérifier la page du skill et l'installer pour vous.
Audit website performance. Use for Core Web Vitals, LCP, INP, CLS, Lighthouse or browser performance checks, bundle and asset weight, image/video loading, font loading, third-party scripts, animation cost, hydration cost, and production-readiness performance review.
Performance Audit Websites
Use this skill to keep premium sites fast enough that visual ambition does not punish users.
Workflow
Inspect the project, scripts, routes, local/deployed URL, production surfaces, and available QA/deployment tooling.
Run the narrowest meaningful checks for the risk: visual, mobile, accessibility, performance, forms, media, SEO, analytics, deployment, or handoff.
Fix issues when they are in scope; otherwise record exact evidence and remaining risk.
Summarize commands, URLs, screenshots/checks, changed files, and what was not tested.
Always Protect
Inspect before changing or shipping: framework, package scripts, build output, routes, forms, media, animation stack, deployment target, environment variables, analytics, SEO metadata, accessibility risks, and available browser QA tooling.
Do not claim something was tested unless it was actually tested; report exact commands, URLs, screenshots, viewports, failures, skipped checks, and remaining risk.
Verify desktop and mobile rendered output, not only source code. For visual or motion work, inspect screenshots, browser behavior, console errors, network failures, and responsive layout.
Treat forms, checkout, booking, CMS content, analytics, environment variables, and deployments as production surfaces with error, loading, empty, success, and rollback states.
Respect accessibility, performance, reduced-motion, and no-JavaScript/no-WebGL/no-autoplay fallbacks where relevant.
Keep secrets out of code, logs, screenshots, summaries, widgets, and committed files.
Prefer project-local tooling and existing scripts before adding dependencies. Explain any new dependency before installing it.
End with a concise handoff: changed files, commands run, checks passed, checks not run, deployment URL if any, and next risks.
