Answer
startTransition marks state updates as low-priority. useDeferredValue delays updating a derived value. Both prevent blocking urgent UI work.
Quick Answer
startTransition: use when triggering an expensive state update from an event — you control when the transition starts. useDeferredValue: use when receiving a value from outside (like a prop or external store) that you want to defer — you can't control when it updates, but you can delay the expensive re-render that responds to it.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ