I have rewritten the Build Configuration chapter of the Rust Performance Book. https://nnethercote.github.io/perf-book/build-configuration.html It's now a much better guide to all the ways you can change the performance characteristics of your Rust program without changing its source code. These characteristics include runtime speed, memory use, binary size, and compile times. Big improvements to your Rust program's performance are possible with simple changes. Try these things out!