Concurrent Rendering in React 18
summary
Explains how React 18 makes rendering interruptible only where you opt in, demonstrating the startTransition API to mark slow updates as low priority and the useTransition hook returning a transition function and an isPending flag for UI feedback. Uses a search-input + results example: typing is treated as an urgent update, results rendering becomes a transition that gets paused and restarted to avoid wasted work, keeping the UI responsive on slower devices.
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