Migrating a 60-route B2B SaaS dashboard from the Pages Router to the App Router took six weeks instead of the planned two. While the performance wins (streaming, nested layouts, and lower Time to Interactive) are real, the official documentation understates the mental shift and architectural pitfalls required for a successful transition.

Enabled Partial Prerendering and watched your Core Web Vitals tank? Here’s why PPR backfires and the fixes that actually work

Still using useEffect to fetch data in Next.js? Learn the 4 modern patterns — async Server Components, the use() hook, Server Actions, and React Query — with real code examples. Updated 2026.