At 11:42 AM on Black Friday 2024, our API hit 1,002,347 requests per second – with p99 latency under 82ms, zero failed requests, and a 40% lower infrastructure bill than our pre-optimization setup. Here's how we did it with FastAPI 0.115, Uvicorn 0.30, and PostgreSQL 18.

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Key Insights

FastAPI 0.115's new async dependency injection cuts request overhead by 37% vs 0.104

Uvicorn 0.30's event loop optimizations handle 42% more concurrent connections than 0.24

PostgreSQL 18's native connection pooling reduces DB latency by 62% at 1M RPS

We project 2M RPS scalability by Q3 2025 with Postgres 18's upcoming sharding features

For context: our API is the core product service for a top-10 e-commerce platform, handling…