pls who knows pc systems well

i have some problems about my gameplay i have asus r7 370 4gb gpu and amd fx6100 3.3 ghz cpu with 16gb ram im playing this game in last two days with 70 fps it was 250-150 before now i start game with 100 then it drop to 70 and im so damn mad i did everything even i remove windows and installed again im using windows 10 and all my drivers are updated please just damn help me
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