Performance is important for many Rust programs.

This book contains many techniques that can improve the performance—speed and memory usage—of Rust programs. The Compile Times section also contains some techniques that will improve the compile times of Rust programs. Some of the book’s techniques only require changing build configurations, but many require changing code.

Some of the techniques within are entirely Rust-specific, and some involve ideas that can be applied (often with modifications) to programs written in other languages. The General Tips section also includes some general principles that apply to any programming language. Nonetheless, this book is mostly about the performance of Rust programs and is no substitute for a general purpose guide to profiling and optimization.

The book also focuses on techniques that are practical and proven: many are accompanied by links to pull requests or other resources that show how the technique was used on a real-world Rust program.

This book is aimed at intermediate and advanced Rust users. Beginner Rust users have more than enough to learn and these techniques are likely to be an unhelpful distraction to them.