[gpm]

What you're completely missing here is that a naive rust compiler would be reasonably close in speed to LLVM's non-naive compilation. Sure some inlining helps a bit, and llvm does some really fancy things that help a bit, but even without those Rust would still be a reasonably fast language. As such you can just right normal rust, and your worst case where the compiler completely fails to help is reasonably fast.

A naive javascript interpreter is really slow, spidermoney and V8 do a ton of work to make it reasonably fast. If there's an important piece of code where the compiler doesn't even completely fail to help, but just helps less than normal, the code is no longer reasonably fast.