Is length still cached in Racket CS?

Length has not ever been cached. list? is cached, and that’s still the case in Racket CS

Oh ok, thanks. That explains the profiler’s results then :)

I think I used to know this, but now I forget: is there a way to turn off blue boxes in DrRacket?

Ok. I think I found it on the “Background expansion” tab in preferences. It still feels like after I type an identifier name there is a long pause.

Which I thought was from the blue boxes.

Is there a way to render math expression in scribble? I remember seeing it in the scribble docs at some point, but I can’t seem to find it now