React Performance: Server — LRU Cache Cross-Request. Keywords: lru cache cross request. Platform: React/Next.js. Description: Use LRU cache for data shared across sequential requests. Do: Use LRU for cross-request caching. Don't: Refetch same data on every request. Good Example: const cache = new LRUCache({ max: 1000, ttl: 5*60*1000 }). Bad Example: Always fetch from database. Severity: High.