Performance Audit Websites Skill for Codex
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.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/TheGoat395/Codex-Skills --skill performance-audit-websitesWhat comes with it
3 314 bytes besides the instructionThe instruction itself
3 sections, as written by the authorPerformance 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.
- Read Performance Audit Websites Guide before claiming the site is ready.
- 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.
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How to use it
Take thegoat395/performance-audit-websites from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.