Racket is more of a meta language. For another example, see Gerbil Scheme (cons.io). It is a meta language written on top of Gambit Scheme. Gambit was chosen because it can compile to portable, efficient and fast C code. Gerbil on Gambit currently tops the R7RS benchmarks [1].

Actually, Gerbil used to be written on Racket. As you can see, it now benefits from Gambit's strengths without having to re-implement them...

[1]: https://ecraven.github.io/r7rs-benchmarks/