Next.js 14 brought significant improvements to performance through the App Router and React Server Components. In this post, we explore practical strategies to get the most out of your Next.js applications and achieve Lighthouse scores above 90.

1. Leverage Server Components by Default

Server Components render on the server and send zero JavaScript to the client. Use them for any component that doesn't need interactivity or browser APIs. The key rule: reach for 'use client' only when you absolutely need state, effects, or event handlers.

2. Optimize Images with next/image

Always use the Image component from next/image to get automatic WebP conversion, lazy loading, and size optimization. Set the priority prop on above-the-fold images to eliminate LCP delays. Properly define width and height or use fill with a sized parent to prevent layout shift.

3. Parallel Data Fetching

Avoid waterfall requests by using Promise.all for independent data fetches. Instead of awaiting sequentially, fire all requests at once and await the combined result — this alone can cut page load time in half on data-heavy pages.