I would not recommend installing windows 10 on a Mac to play games at this moment, I did it using boot camp and it was horrible, poor driver support for my video card (rMBP) so I end up installing a windows 7 which gives me about 3 times more fps per game compared to w10, and about twice as fast as windows 8.1, also my mouse seems lagging when gaming in both 8.1 and 10, works perfect on 7 thought.