# Performance Audit Websites

> Diagnose measured runtime and Core Web Vitals.

- Skill: `thegoat395/performance-audit-websites` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add thegoat395/performance-audit-websites`
- Raw SKILL.md: https://api.skillmd.com/api/skills/thegoat395/performance-audit-websites/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: TheGoat395 (https://skillmd.com/u/thegoat395)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/thegoat395/performance-audit-websites

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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. Run the narrowest meaningful checks for the risk: visual, mobile, accessibility, performance, forms, media, SEO, analytics, deployment, or handoff.
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.

Separate field data, controlled lab data, source inspection, and inference. A Lighthouse score from one machine is not a field-performance guarantee; an optimized source pattern is not a measured user improvement.

## Scoped execution

Apply the [shared web contract](../website-operating-rules/references/scoped-web-contract.md) once when execution crosses phases; reuse it if already read. Load only the specialist guidance relevant to the requested surface and deliverable.