How To Use useDeferredValue Hook In React? Complete Example

useDeferredValue allows you to defer updates for non-urgent values.
It’s useful to avoid blocking the UI when updating large lists or heavy computations.

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Basic Syntax

const deferredValue = useDeferredValue(value);

• Returns a deferred version of the input value
• Useful for optimizing performance

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Example: Deferred Input Filtering

import React, { useState, useDeferredValue } from "react";

function App() {
  const [text, setText] = useState("");
  const deferredText = useDeferredValue(text);

  const list = Array.from({ length: 10000 }, (_, i) => i).filter((n) =>
    n.toString().includes(deferredText)
  );

  return (
    <div>
      <input type="text" value={text} onChange={(e) => setText(e.target.value)} />
      <p>Results: {list.length}</p>
    </div>
  );
}

export default App;

✅ Filtering uses deferredText to prevent UI lag.

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Key Points

• Defers non-urgent state updates
• Works well with large datasets
• Prevents UI blocking
• Complements useTransition for smooth rendering

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Conclusion

useDeferredValue keeps React apps fast and responsive, especially when handling heavy computations or large lists.

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Citations

https://savanka.com/category/learn/react/
https://www.w3schools.com/REACT/DEFAULT.ASP