React Performance: Server — React.cache Dedup. Keywords: react cache deduplicate request. Platform: React/Next.js. Description: Use React.cache() for server-side request deduplication within single request. Do: Wrap data fetchers with cache(). Don't: Fetch same data multiple times in tree. Good Example: export const getUser = cache(async () => await db.user.find()). Bad Example: export async function getUser() { return await db.user.find() }. Severity: Medium.