[jungler]

For that particular question: They would all be the same speed because the optimization requirement would lead each one to write a compiler in their language of choice that emits a perfectly tuned assembly binary.

What gets overlooked in language performance is that you pick a language for what are, in essence, placeholder constructs. The performance matters only in that you need it to be fast enough "off the shelf" that you don't have to start writing a compiler. But you generally aren't prevented from using that approach to boost your existing code, and high performance systems often converge on that strategy in some degree, because it lets you keep maintainable source code and add toggles for debugging and optimization that you won't get from treating the application and compiler code as separate entities.