I'm not sure compiling through C is really slower than using LLVM. For example, I haven't used Rust or Nim very recently, but a few months ago when I tried them

I'm not sure compiling through C is really slower than using LLVM. For example, I haven't used Rust or Nim very recently, but a few months ago when I tried them on some toy programs, Nim compiled significantly faster than Rust. This of course might just be a matter of the implementations of the two compilers.