Core Web Vitals and Monitoring
Understand LCP, INP, and CLS, measure them in real users, and use Next.js features and observability tools to keep your production app fast.
What Are Core Web Vitals
Core Web Vitals are Google's user-centric performance metrics that influence both UX and SEO ranking. The three current metrics are:
- LCP — Largest Contentful Paint (loading)
- INP — Interaction to Next Paint (responsiveness)
- CLS — Cumulative Layout Shift (visual stability)
LCP: Loading Speed
LCP measures when the largest visible element (often a hero image or heading) finishes rendering. Aim for under 2.5s. Improve it with image optimization, priority loading, and server rendering.
import Image from 'next/image';
<Image src="/hero.jpg" alt="Hero" width={1200} height={600} priority />All lessons in this course
- Deploying to Vercel and Netlify
- Image and Font Optimization
- Bundle Analysis and Performance Audits
- Core Web Vitals and Monitoring