> When does the Rust compiler spend most of it's time? Is it at the checking stage? rustc has a self-profiler that can be used to answer this question [0], as

> When does the Rust compiler spend most of it's time? Is it at the checking stage? rustc has a self-profiler that can be used to answer this question [0], as well as a mode that times compiler passes [1]. There's no single reason the Rust compiler is slow, as it depends quite heavily on the code being compiled. For some codebases, LLVM code takes up most of the time; in other codebases (e.g., extremely generic-heavy codebases), it'll be checking-related passes. [0]: https://github.com/rust-lang/measureme/blob/master/summarize/Readme.md https://github.com/rust-lang/measureme/blob/master/summarize... [1]: https://wiki.alopex.li/WhereRustcSpendsItsTime https://wiki.alopex.li/WhereRustcSpendsItsTime