1---2name: react-performance3description: What I do4---5## What I do67Je fournis des règles de performance pragmatiques :8- memoization sur besoin9- virtualisation pour grandes listes10- stabilité des props1112## Decision checklist13Memoize seulement si au moins un de ces points est vrai :14- rendu coûteux15- liste volumineuse16- composant memoïsable (pur)17- callbacks stables nécessaires1819## Examples2021```ts22const derived = useMemo(() => heavy(users), [users]);23const onSelect = useCallback((id: string) => setId(id), []);24```2526## Don’t27- "optimiser" avant d'avoir un problème mesurable.
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