performance-audit

Check and improve Core Web Vitals and load performance against practical Lighthouse gates — LCP, CLS, fonts, images, unused JS, third parties, caching, and…

Skill by DevJanidu

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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/devjanidu-performance-audit

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About

Check and improve Core Web Vitals and load performance against practical Lighthouse gates — LCP, CLS, fonts, images, unused JS, third parties, caching, and compression. Use at the TEST state. Fix controllable issues; explain third-party limits honestly.

Use cases: testing, security

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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Network hosts it talks to 1

codeload.github.com · found in install command

Files it touches

~/.claude/skills/performance-audit

What's inside

Skill name: performance-audit
Description: Check and improve Core Web Vitals and load performance against practical Lighthouse gates — LCP, CLS, fonts, images, unused JS, third parties, caching, and compression. Use at the TEST state. Fix controllable issues; explain third-party limits honestly.
License: MIT
Instructions: 21 lines in SKILL.md · view on GitHub

Files (1)

SKILL.md

SKILL.md (first lines)

# Performance Audit

## Practical gates

Aim for Lighthouse **Performance ≥ 85, Accessibility ≥ 95, Best Practices ≥ 95, SEO ≥ 95**. Do not promise 100 — some factors (embedded maps, third-party booking widgets, ad/analytics scripts) are outside your control. State those honestly.

## Inspect

- **LCP**: prioritize/preload the hero image; avoid render-blocking resources above the fold.
- **CLS**: explicit `width`/`height`/`aspect-ratio` on all media (ties to `../responsive-design/SKILL.md`); reserve space for embeds/fonts.
- **Fonts**: `font-display: swap`, preload the critical face, drop unused weights.
- **Images**: modern formats + responsive sizes from `../image-pipeline/SKILL.md`; lazy-load below fold.
- **JavaScript**: remove/defer unused JS; avoid shipping a heavy client bundle for a mostly-static site (a reason Astro/Blade beat SPA for brochure sites — see `../seo/SKILL.md`).
- **Third parties**: defer maps/widgets/analytics; load on interaction where possible.
- **Delivery**: enable caching and compression (gzip/brotli) at the host.

## Report & fix

Run Lighthouse where available (or the framework's build report), fix what you control, re-measure, and record remaining third-party limitations in the handoff rather than hiding them.

From DevJanidu/curb-appeal, MIT.

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Last commit (this folder): Jul 18, 2026 (3 months ago)

From GitHub (fetched Oct 24, 2026).

Details

License: MIT
Repository: github.com/DevJanidu/curb-appeal
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql

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performance-audit skill. Agent Mart. https://agentmart.dev/skills/devjanidu-performance-audit (last updated 2026-10-24)