> (macros and traits I guess are the worst) This is a common assumption but I've rarely see cargo check, which both expands macros and solves traits as well as

> (macros and traits I guess are the worst) This is a common assumption but I've rarely see cargo check, which both expands macros and solves traits as well as runs the borrow checker take more than a few seconds on my machine, even when full compilation takes minutes. Most of the slowness is really in the parts that come afterwards, I suspect especially once you hit the generics explosion in later passes.