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I don't exactly see a pattern to this at all but I've experiences a lot of horrible framrate issues from time to time. Usually when I first boot the game up. Trying to navigate through the menus it goes into single digits. The only "fix" i've found is try and Alt+Tab out, close some background apps, then Alt+Tab back in. Sometimes this works. Other times i toggle between Fullscreen and Windowed modes but this is a very anoying problem. Any else experienced this?