wtf is go-perfbook?

This repository is a community-written guide on how to make Go programs run faster. Go is a programming language developed by Google and is widely used for building backend services and tools. Performance optimization means identifying where a program spends unnecessary time or memory, then changing the code to fix it. The guide is organized as a single long document (with a table of contents) split into two broad halves. The first half covers optimization ideas that apply to any programming language, such as how to think about optimization as a workflow, how to pick better algorithms, how to structure data so it is faster to access, and how to write meaningful benchmark tests. The second half focuses specifically on Go: how Go handles memory cleanup (called garbage collection), how its runtime and compiler work under the hood, how to use profiling tools to find slow spots in a running program, and when to use lower-level techniques like writing in assembly language. There are also sections on common mistakes when using Go's standard library, how to call C code from Go (a feature called CGO), and how to think about performance at the level of an entire service rather than a single function. The document is available in English, Chinese, Spanish, and Brazilian Portuguese. It is described as a work in progress, and contributions are welcome through the Gophers community Slack channel. The README is short, the main content lives in the linked markdown files inside the repository.