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.

1k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

115

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/TheGoat395/Codex-Skills --skill performance-audit-websites

What comes with it

3 314 bytes besides the instruction

agents/openai.yaml

references/performance-audit-websites-guide.md

The instruction itself

3 sections, as written by the author

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.
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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13k tokens

How to use it

Copy the folder

Take thegoat395/performance-audit-websites from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

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.