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I'm running Windows 10 and its actually running smooth, no FPS drops. Well look spam machine, you might want to install your drivers properly. I encountered this problem when I installed it for the first time, my FPS was like from 100 to 3, you just need to update Windows if not updated, and install display driver.... Or simply just downgrade your windows, which I don't recommend. On the other side your PC specifications may not be enough for running the Windows smoothly, or your PC isn't compatible with x64-bits architecture