Analyzing and Troubleshooting Bottlenecks in FastAPI: Optimizing Auth Flow, Cryptography, and Data Serialization

This article is intended for those who, like me, are interested in profiling and performance optimization. Key Takeaways (TL;DR): Offload CPU-bound crypto: Move synchronous operations like Argon2id into a ThreadPoolExecutor to stop them from blocking the asyncio event loop. Choose the right algorith