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There is something seriously wrong with this game.
Whenever I go fullscreen the framerate tanks. It's not a performance issue. I'm running it on a GTX 1070 and i5 4690k @ 4,2ghz with 16gb ram. I turned on DSR just to be able to run the game at 1080p in a window and I got 200+ fps, but as soon as I try fullscreen (at the same resolution) it tanks to ~30 (variable, so it's not even smooth).