The performance is around Python / general scripting level; perfectly acceptable.
As you guessed, DrScheme became DrRacket.
You can find more info at https://www.racket-lang.org, presented much better than I could do here.
Performance: closer to Groovy, Clojure or Raku than to Python, Ruby or JS. That is, startup is not as fast, but execution after that is decent. For a few years, performance improvements were not the focus of development due to the migration from custom VM to Chez Scheme. Now Racket on Chez is the default and I think we'll see further improvements on that front (easier maintenance and better potential performance were the reasons behind the migration IIRC.)
The community is small, and the core strength of Racket is not something normal programmers use in day to day programming (that strength being the ability to shape the syntax and semantics of your code at will, ad hoc, anytime, with no friction at all, in any way you want). On the other hand, the results of giving that power to a bunch of very smart people are really worth seeing.