The 3-Layer Caching Stack for 10x Web Scaling
Scaling high-traffic web platforms requires distributing workloads across three distinct caching tiers to ensure dynamic databases are queried only when strictly necessary.
Tier 1: Global Edge CDN
Caches static assets (CSS, JS, WebP images, fonts) on 300+ global edge locations. Serves 80%+ of incoming requests directly from the visitor nearest metropolitan data center.
Tier 2: Reverse Proxy Micro-Caching (Nginx / Varnish)
Stores pre-rendered HTML responses in server memory for 1 to 60 seconds. Drops origin dynamic request processing from 1,000 req/sec down to 10 req/sec during traffic surges.
Tier 3: In-Memory Object Cache (Redis)
Caches complex SQL queries, session data, and transient API responses in RAM, allowing sub-millisecond database lookups without hitting NVMe storage.