I'm running on an older machine, and it runs fair enough, I wasn't expecting 120 fps. I have an I7 860 w 8GB of RAM running Windows 10 64 bit. My video card is a Nvidia GTX260. Drivers are the latest available for that card which are 342.01.
Not sure if it's related to my specific machine or not but figured I would post one issue I ran into. Anytime I have to swap the interface out or render to another area and back to the game screen, I get a black screen with the UI over it and my FPS drops to almost nothing. For instance when I flew over to make a character things were fine until I finished and went back to the game world. It was black and getting 10 fps and had to exit and come back in. When I came back in everything was fine again and I wandered around and explored just fine, but after I hit M to check my map and came back, it was black again and losing FPS and had to exit out again. Several time I was able to reproduce this.