AA on? If so, turn off, FPS booster right there...
V-Sync off? On?
Turn off for FPS boost...
the most frequent scenario is a game (full screen)...and the reason why the fps decreases is because the video system applies more computational power to obtain vsync........ideally if your screen refresh rate is 60 when you apply vsync your game will only display 60 fps...
Another thing that's a fps killer is Anti-Virus!
Turn off... see if things improve.
Update once you've tried these 3 options and let us know.
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