core-web-vitals-tuner
Systematically improves Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) with prioritized fixes and verification. Use for "Core Web Vitals", "performance", "LCP", "INP", or "CLS".
- Installs
- 310
- Last 24h
- —
- Trending rank
- —
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/patricio0312rev/skills --skill core-web-vitals-tuner- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads core-web-vitals-tuner automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Core Web Vitals Tuner
Improve LCP, INP, and CLS systematically.
LCP Optimization (<2.5s)
Prioritized Fixes:
-
Optimize images (Biggest impact)
<!-- Before --> <img src="hero.jpg" /> <!-- After --> <img src="hero.jpg" srcset="hero-400.webp 400w, hero-800.webp 800w, hero-1200.webp 1200w" sizes="(max-width: 600px) 400px, (max-width: 1200px) 800px, 1200px" loading="eager" fetchpriority="high" /> -
Preload LCP resource
<link rel="preload" as="image" href="/hero.webp" fetchpriority="high" /> -
Inline critical CSS
<style> /* Above-the-fold styles */ .hero { display: flex; height: 100vh; } </style> -
Use CDN
- Serve images from CloudFront/Cloudflare
- Enable HTTP/2 or HTTP/3
INP Optimization (<200ms)
Fixes:
-
Debounce expensive interactions
import { debounce } from "lodash"; const handleSearch = debounce((query) => { fetchResults(query); }, 300); -
Use Web Workers for heavy tasks
const worker = new Worker("processor.js"); worker.postMessage(largeData); worker.onmessage = (e) => console.log(e.data); -
Code splitting
const HeavyComponent = lazy(() => import("./HeavyComponent"));
CLS Optimization (<0.1)
Fixes:
-
Reserve space for images/ads
<img src="banner.jpg" width="1200" height="600" /> -
Use CSS aspect-ratio
.video-container { aspect-ratio: 16 / 9; } -
Avoid injecting content above existing
.notification { position: fixed; top: 0; }
Verification
# Lighthouse CI
npm run lighthouse -- --url=https://example.com
# Web Vitals in production
import { getCLS, getFID, getLCP } from 'web-vitals';
getCLS(console.log);
getFID(console.log);
getLCP(console.log);
Output Checklist
- LCP optimized (<2.5s)
- INP optimized (<200ms)
- CLS optimized (<0.1)
- Monitoring in place
- Performance regression tests ENDFILE
FAQ
What does the core-web-vitals-tuner skill do?
Systematically improves Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) with prioritized fixes and verification. Use for "Core Web Vitals", "performance", "LCP", "INP", or "CLS".
How do I install core-web-vitals-tuner?
Run npx skills add https://github.com/patricio0312rev/skills --skill core-web-vitals-tuner in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/core-web-vitals-tuner/ (personal) or .claude/skills/core-web-vitals-tuner/ (project).
Which AI agents can use core-web-vitals-tuner?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is core-web-vitals-tuner safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains core-web-vitals-tuner?
It is published by patricio0312rev in patricio0312rev/skills. It has 310 recorded installs.
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