Computer FPS problems

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So here is the issue... Check that great fps out. 7.6 frames... I have been having this problem recently, every minute or so my computer dives from 50-60 frames a second to this. It lasts around 20 seconds, and raises back to the original.. I am sick and tired of dying and losing due to this great amount of fps drop, and im not sure on what to do. I have updated all my drivers, i cleaned my computer from useless programs, ive run scans etc... Friends pointed me to an overheat of the computer, i was wondering what your perspective on this is. I will clean my computer out tomorrow*** Any help thats not "have you tried turning it off and on again" is appreciated :)

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