الاختيار بين useTransition وuseDeferredValue

Comparison Angle

useTransition

useDefferredValue

What it defers

A state update function

A changing value

Primary purpose

To delay expensive updates that are triggered by user actions (e.g., filtering, navigation)

To delay re-renders caused by rapidly changing inputs or props

Typical use case

When an action (like typing or clicking) triggers a heavy computation or re-render

When the app re-renders too frequently due to fast-changing input data

API signature

[isPending, startTransition] = useTransition()

const deferredValue = useDeferredValue(value)

Feedback mechanism

isPending flag — lets you show a loading state during the transition

Compare value !== deferredValue to show that deferred updates are in progress

When it’s triggered

You manually wrap a state update function inside startTransition()

React automatically manages timing when the deferred value changes

Analogy

Delay when the update happens.

Delay what data the update uses.