React useDeferredValue Hook Cheat Sheet

What is `useDeferredValue`?

A React Hook that defers updating a value until the browser is less busy — great for keeping UIs responsive during expensive renders.

import { useDeferredValue } from "react";

Use Case

Use it when you want to:

• Keep input snappy while rendering slow content
• Avoid blocking UI with heavy computations or long lists

Basic Syntax

const deferredValue = useDeferredValue(value);

Example: Deferring a Filter

const [query, setQuery] = useState("");
const deferredQuery = useDeferredValue(query);

const results = useMemo(() => {
  return items.filter(item => item.includes(deferredQuery));
}, [deferredQuery]);

return (
  <>
    <input value={query} onChange={e => setQuery(e.target.value)} />
    <List items={results} />
  </>
);

• query updates immediately
• deferredQuery lags slightly to avoid blocking render