After some research, it seems like your issue is pretty common, and that this game just seems to do that. Doesn’t really look like there’s a fix, my only suggestions would be to make sure your power supply is beefy enough to handle stress tests outside of the game, and plug your PC into a different wall outlet to see if that helps, but I’m willing to bet this is an issue with the game itself.
From what I’ve found it seems like this game has always been a buggy slow mess on pc and in the past year or so I’ve seen several support posts reporting this exact issue, with no fix :/