As a racket user I wouldn't say racket is a good scripting language unless you use racket/base and manually require the extra cruft. Startup is quite darn noticeable even on my relatively fast ssd-equipped laptop. For small scripts the startup time is often by far the largest part of the total run time.

But yeah, racket is fun.

As a scripting language the startup is a pain (It has been getting much needed attention just this past month and they are seeing a big improvement on that)

In terms of having a soft spot for lisp and clojure I find that Racket is the best thing ever for scratching that itch. I really am excited by clojure for scripting though.

Racket Scripting https://docs.racket-lang.org/guide/scripts.html

Certainly many little tricks to help with speed.

Not recently, but did a lot with mzscheme back in the day.

I've had racket, and particularly the plt redex stuff, on my list for someday when I have time for a while now.