FPS drop since 7.13 patch

I have problems with FPS since patch 7.13. Namely, earlier I had FPS on very high settings between 80-120. Since patch 7.13, my FPS is between 40-50. The worst is that in teamfight, FPS falls to 20-30, and it's really frustrating. I can't play at such small FPS, because on the same setting a couple days ago, I had 120 FPS. Thumb up to support can see my problem. Ty. Sorry for bad English.
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