ReddRadar
Agent skill
rerender-memo
Extract expensive work into memoized components with React.memo. Apply when components perform expensive computations that can be skipped when props haven't changed.
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Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/rerender-memo
SKILL.md
Extract to Memoized Components
Extract expensive work into memoized components to enable early returns before computation.
Incorrect (computes avatar even when loading):
tsx
function Profile({ user, loading }: Props) {
const avatar = useMemo(() => {
const id = computeAvatarId(user)
return <Avatar id={id} />
}, [user])
if (loading) return <Skeleton />
return <div>{avatar}</div>
}
Correct (skips computation when loading):
tsx
const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {
const id = useMemo(() => computeAvatarId(user), [user])
return <Avatar id={id} />
})
function Profile({ user, loading }: Props) {
if (loading) return <Skeleton />
return (
<div>
<UserAvatar user={user} />
</div>
)
}
Note: If your project has React Compiler enabled, manual memoization with memo() and useMemo() is not necessary. The compiler automatically optimizes re-renders.
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