Low Fps for last few patches

Hello everybody, i've been having low fps for the last few patches. I used to have 130-140 fps (Even in teamfights) Then, since around 8.16, its been around 60 suddently. Now since 8.20 came out 2 days ago, i have around 50-40 fps and its really getting to low for my standards. Switching between Very high graphics and very low graphics makes very little difference, about 10 fps higher max, idk why so i just play very high now when i test. Has anybody ever experienced this, and if so, do you know how to help? Please hit me up here! :)
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