Earlier quoted context omitted.
> “fast” languages What are those?
C++, Rust, .Net would qualify, Go (doesn’t have a “release mode as such, but achieved decent speed), Julia, etc Anything that makes an actual attempt at optimising for performance.
Not a programming language. (And you seemed to have missed the point; a "fast language" is essentially a nonsense term.)
> Anything that makes an actual attempt at optimising for performance.
So something like any of the modern JS engines...?