When you enable Concurrent Mode, you unlock several powerful features in React:

1. Suspense for Data Fetching

   • Lets you declaratively "wait" for asynchronous operations like data loading.
   • React can pause rendering until the data is ready without freezing the whole app.

2. Transitions

   • You can mark certain updates as non-urgent (e.g., switching tabs, filtering lists).
   • React can prioritize keeping the UI responsive while doing those transitions in the background.

3. Selective Hydration (for server-side rendering)

   • React can prioritize hydrating (activating) only the most important parts of a page first, like buttons or inputs the user interacts with.

4. Time Slicing

   • React breaks work into small units and spreads it over multiple frames.
   • This way, high-priority interactions can interrupt low-priority rendering.

5. Concurrent Rendering

   • React can prepare multiple versions of the UI at the same time and decide which one to commit based on user actions.

Summary:

Concurrent Mode brings features that help apps load faster, stay responsive, and handle asynchronous operations more gracefully.

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