How React 18’s Automatic Batching Reduces Renders and Boosts Performance

React 18 introduces automatic batching that merges multiple state updates into a single render across all contexts—including promises, timeouts, and native events—improving performance while offering opt‑out mechanisms like flushSync for rare cases where immediate DOM updates are required.

Automatic BatchingReactReact 18

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How React 18’s Automatic Batching Reduces Renders and Boosts Performance