Understanding React Server Components
A deep dive into how React Server Components (RSC) fundamentally change the way we build web applications in Next.js 14 and beyond.
2026-03-23
ReactNext.jsPerformance
React Server Components allow you to write UI that can be rendered and optionally cached on the server. In Next.js, the rendering work is further split by route segments to enable streaming and partial rendering.
The Problem with Traditional SPA
1. Zero Bundle Size Impact: Dependencies used within a Server Component never get sent to the client.
2. Direct Backend Access: You can directly query databases or backend services securely without exposing secrets.
3. Automatic Code Splitting: Server Components cleanly split client-side and server-side logic inherently.
*Built with Next.js 14 App Router.*
The Problem with Traditional SPA
In traditional Single Page Applications (SPAs), the client has to download essentially the entire application code before it can render the first meaningful paint. This results in bloated JavaScript bundles and slow time-to-interactive on slower devices.
## How Server Components Help
By moving the rendering to the server, Server Components address these issues directly:
1. Zero Bundle Size Impact: Dependencies used within a Server Component never get sent to the client.
2. Direct Backend Access: You can directly query databases or backend services securely without exposing secrets.
3. Automatic Code Splitting: Server Components cleanly split client-side and server-side logic inherently.*Built with Next.js 14 App Router.*