Google's Core Web Vitals measure real-world user experience signals: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS).
Performance Optimization Breakdown
1. Largest Contentful Paint (LCP < 1.2s) - Use Next.js `next/image` with `priority` attributes on Hero images. - Convert image assets to modern AVIF/WebP formats. - Preconnect to key font and asset domains.
2. Interaction to Next Paint (INP < 50ms) - Defer non-critical JavaScript execution off the main looper thread. - Eliminate long-running synchronous event handlers in React components.
3. Cumulative Layout Shift (CLS = 0.00) - Set explicit width and height dimensions on all images and containers. - Reserve static bounds for dynamic content to prevent layout reflows during hydration.
Tags:#Core Web Vitals#LCP#INP#CLS#Lighthouse#Performance
MZ
Written by Mirza Zain
Founder & Lead Software Architect at NextApex Studio. Specializing in Next.js 16, React 19, TypeScript, Generative Engine Optimization (GEO), and full-stack SaaS architecture.
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