Question pc low fps

Oct 25, 2020
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Hey my pc was working fine on june and a few month after but then it slowly started to give
low fps. My specs
cpu i5-9600k 3.70GHz
gpu rtx 2070 super

as of now my fps on warzone and fortnite used to be at 150 and almost to 200 fps,
but now its at low 80s is it from me using my pc?