People who say "Rust compiling is so slow" have never experienced what building large projects was like in the mid-1990s or so. It's totally fine. Besides, there's also https://xkcd.com/303/
Not really relevant. The benchmark is how other language toolchains perform today, not what they failed to do 30 years ago. I don't think we'd find it acceptable to go back to mid-'90s build times in other languages, so why should we be ok with it with something like Rust?