In this book, you will find everything you need to improve the performance of your Rust code; you will learn many tricks and use helpful crates and tools. Therefore, the book is written from the basis that you already have some knowledge of programming in Rust.
This book will not cover the whole world of high-performance programming since it's an incredibly wide topic. You will find a gentle introduction to most of the generic high-performance programming concepts and learn how specific patterns can be used in the Rust programming language.