Modest pc here: Nvidia 1060, Intel 3770K. I've had no complaints all the way through from Alpha, on the face of it Update 5 was fine, then in settlements, something I've not had before, suddenly the framerate will drop to the speed of somebody quickly changing 35mm slides, for a few seconds, then it's okay if a bit stuttery, till the next time. When it starts it seems to happen for a few seconds with a gap between 30 seconds and a couple of minutes. Given that I've had nothing like this before, maybe the issue is easier to identify?