Next.js Performance Optimization

Before Starting

1. Analyze current performance with Lighthouse
2. Identify bottlenecks - check Core Web Vitals in Chrome DevTools or PageSpeed Insights
3. Determine optimization priority:
   • LCP issues → Focus on images, fonts
   • INP issues → Reduce JS, use Server Components
   • CLS issues → Add dimensions, use next/font

Core Principles

1. Prefer Server Components - Only use 'use client' when necessary (browser APIs, interactivity)
2. Load components as low as possible - Keep Client Components at leaf nodes
3. Use Suspense boundaries - Enable streaming and progressive loading
4. Cache appropriately - Use tags for granular revalidation
5. Measure before/after - Always verify improvements with real metrics