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Lessons Learned From Switching From Python to Rust

An engineering team migrated its backend from Python’s FastAPI to Rust’s Actix‑Web to address performance, cost, and reliability concerns. Benchmarks showed Rust delivering significantly higher request throughput, lower latency, and reduced memory footprints, while Diesel’s type‑safe ORM caught many errors at compile time. However, FastAPI retained advantages in rapid development, automatic OpenAPI documentation, and a lower entry barrier. The switch also simplified deployments through single‑binary containers, though it demanded longer compile times and a steep learning curve.