And in terms of speed, Racket is generally quite a lot faster than Python. I remember the days when rhetorically people almost assumed that poor execution speed meant higher-level abstractions that translated to greater developer productivity. Slow execution practically became a fitness function (I'm looking at the commentary during the early days of Ruby and Rails here).

But with Racket you've got high-level, comparable-to-Python abstraction combined with way better performance today, and even better performance tomorrow. Plus as a bonus, the typed story is good.

EDIT: In summary, even if performance wasn't your objective, you're still punching well above comparably high-level languages like Python.