FPS issue

I dont know if it me but i have been playin alot then all of a sudden my screen and movement of my guns are lagging like crap and my fps is dropping and raising high. I was wondering if anyone know the problem. I know it isnt my graphic card nor my pc. Which is AMD Phenom(tm)9750 Quad-Core Processor 2.40GHz RAM 8.00 64-bit Operation System. With a NVIDIA GeForce 9100.Also the fps change happen few mins in the game while im playing and it been bother me and makes me dont even wanna play. Also my connect isnt a problem i have the cable guy came over not to long ago.

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