Okay, I like this game, I don't even mind the separate chapters so far, but and this is the first time I actually encountered this.
The second chapter either drives up the temperature in my GPU into dangerous territory in a few minutes or at some point it just demands more and more work from my CPU, until it maxes out at 100/ usage with about 90% being for pleasure thieves.
It's really weird, because you always read of Unity games taking a large toll from systems, but I never encountered this problem at all, until now with this second chapter.