hard20 pts · first answer countsreact-concurrencyreact-performance

Typing lags while a big list filters

Each keystroke in a search box filters and re-renders a list of 3,000 rich rows, and typing feels laggy. Without changing the list size, which React feature helps the input stay responsive?

A.Keep the input state urgent and update the filter query inside startTransition (or use useDeferredValue for the list)B.Move the input state into a ref so React never re-rendersC.Wrap the list in Suspense with a spinner fallbackD.Call flushSync around every setState in the input handler

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Typing lags while a big list filters

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