My laptop is 7 years old and it’s stone-cold after running Randomtest a few thousand times and I can do any other task while I wait with no slowdown. It really shouldn’t be making your laptop heat up like that. I’ve never heard of that behavior before.
Does your laptop routinely slow down with other unrelated tasks? How old is it and how are you launching Randomtest?
3 years old, a cheap one, I only notice it slows down when tasks in question are blatantly demanding for my hardware and systems like when I’m using an editing program.
I launch random test through IDE, right-clicked on project, press random test, didn’t change anything, and just launched.