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React Server Components change how you build apps. These components run on the server. They send HTML to the browser. This makes your site load faster. It shrinks your JavaScript bundle. You get direct data access.
Next.js App Router uses Server Components by default.
- Server Components: Direct database access. No hooks. No event handlers.
- Client Components: Handle interactivity. Use hooks. Use 'use client' to mark them.
Start with Server Components. Only use Client Components for interactive parts. This keeps your app light.
Fetch data directly in the component. Stop using useEffect for this. This prevents request waterfalls.
Use streaming. The server sends HTML as it finishes. Your page appears faster.
Move slowly. Start with data-heavy pages. Use the App Router for new pages. Keep old pages in the Pages Router.