Nextjs Performance

This is the performance optimization reference you want when your Next.js app's Lighthouse score is tanking or Core Web Vitals are failing. It covers the usual suspects: converting Client Components to Server Components, setting up next/image with priority flags for LCP, implementing unstable_cache with revalidateTag for smarter invalidation, and using Suspense boundaries for streaming. The examples show actual before/after code for common patterns like killing useEffect fetches in favor of async Server Components. Updated for Next.js 16 and React 19, so the patterns reflect current best practices. Most useful when you're beyond basic setup and need to systematically fix performance issues rather than guess at optimizations.