STACK version 4.2.1
Maxima version 5.38.1
Yeah, I know... we're in the process of upgrading.
One of our tutors was complaining that creating a great number of STACK questions took very, very long. I checked the settings and in the STACK functionality check sometimes the formulas wouldn't even be properly displayed. It eventually hung up on me. I don't know why, but we had
timeout --kill-after=180s 180s <path>/lisp.run -q -M <path>/maxima-optimised.mem