I don't think borrow checking plays a significant roles in most projects compiling performance. Running `cargo check` generally runs a lot faster (after the fir

I don't think borrow checking plays a significant roles in most projects compiling performance. Running `cargo check` generally runs a lot faster (after the first run) than `cargo build`, even if it runs borrow checking, etc. AFAIR macro expansion, LLVM code generation and linking takes a lot of time, but it depends on the project. In the perf site you can see some examples: https://perf.rust-lang.org/ https://perf.rust-lang.org/