Core Web Vitals Tuner

Improve LCP, INP, and CLS systematically.

LCP Optimization (<2.5s)

Prioritized Fixes:

Optimize images (Biggest impact)

Preload LCP resource

Inline critical CSS

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

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