I tried playing this game on my m1 max and it was running pretty good, except for terrible frame drops whenever the temperature dropped. It went from 45fps to 10fps, for all of the time that the animation for temperature drop was playing. Found the only setting that caused this was global illumination.

It is probably a game bug that can be fixed, but I don't think the devs will do it since they are focused on frostpunk 2.