Note: If you get to the minotaur VR game a second time, under any circumstances, do not interact with the empty throne. If you do manage to trigger the event on the throne, it'll lock you in the first event and teleport you back to where the first event ended. Having you to do everything again from that point on.
EDIT: My guess for the performance is, there seems to be raytracing or something of equivalent activated by default, whether your card can do it or not doesn't matter. It would at least explain the horrid performance. lol