The Fiber reconciler, which became the default reconciler for React 16 and above, is a complete rewrite of React's reconciliation algorithm to solve some long-standing issues in React.
This change allows React to break away from the limits of the synchronous stack reconciler, enabling it to pause, resume, and restart rendering work as new updates come in.
With React Fiber, developers can now split work into chunks and prioritize tasks based on importance, ensuring critical updates are processed first.
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