Caching Strategies

Caching is the most impactful performance optimization technique, storing frequently accessed data in faster storage layers. From browser caching and CDN edges to application-level Redis caches and database query caches, a well-designed caching strategy can improve response times by 10-100x. Understanding cache patterns (cache-aside, write-through, write-behind), invalidation strategies, and cache hierarchy is essential for building high-performance applications at scale.