FastAPI Performance Tuning: Caching, Async, and Production Bottlenecks (opens in new tab)

FastAPI Performance Tuning: Caching, Async, and Production Bottlenecks I've tuned FastAPI applications from handling 50 req/s to 5,000+ req/s in production. The gap between a "working" FastAPI app and a fast one isn't magic—it's understanding where time actually goes and fixing it systematically. Most performance advice is generic ("use caching", "go async"). This post is specific: here's what killed my APIs, how I measured it, and the exact patterns I use now in CitizenApp. The Three Bottlen...