nextjs15-performance

To optimize slow data fetching in Next.js 15, you should wrap slow data requests in Suspense boundaries. This breaks waterfall patterns, improves concurrency, and allows your React components to render progressively instead of blocking the entire page load.

The best way to reduce bundle size from barrel imports is to enforce direct imports. By replacing barrel imports with direct component imports, you prevent unused JavaScript from being bundled into your production build, significantly reducing payload size.

To secure Server Actions in Next.js 15, you must implement explicit authentication checks inside the server action functions. This ensures that only authorized users can execute server-side mutations and prevents unauthorized access to your backend logic.

Yes, you need to run npm run build && npm run start for Next.js production testing. This ensures your application runs under production conditions, which is necessary to accurately measure performance and validate build optimizations.

Next.js 15 performance issues often occur when data fetching creates waterfall patterns. You can resolve this by applying concurrency patterns, wrapping slow data in Suspense, and using direct imports to reduce the overall JavaScript payload.