react19.txt

React Server Components (RSC)
* Run components on the server, send serialized results to the client.
* Reduces bundle size & improves performance.
* Great for heavy logic/data fetching.

2️⃣ Concurrent Rendering
* React can prepare multiple UI updates in the background.
* Keeps apps responsive even with heavy computations.

3️⃣ Suspense for Data Fetching
* Suspense is no longer just for lazy loading.
* Handle async data (e.g. API calls) with clean UI fallbacks.

4️⃣ Automatic Batching
* Multiple state updates in the same event cycle get batched automatically.
* Fewer renders → better performance out of the box.

5️⃣ useSyncExternalStore Hook
* Standard way to subscribe to external stores (Redux, Zustand, etc).
* Ensures UI consistency across concurrent rendering.

6️⃣ React Compiler (a.k.a React Forget)
* Optimizes React code at compile-time.
* Removes unnecessary re-renders without manual memoization.

7️⃣ useOptimistic Hook
* Manage optimistic UI updates.
* Example: instantly show “comment added” before server confirms it.
* Makes apps feel fast and user-friendly.