New Patch lower fps

Hello guys in this patch i've got lower fps in the last patch i was with 140-180 now im with thata fps only in the start after 10 min in the game from 140 fps i go to 120 fps after more 20 minutes from 120 fps i go to 80 fps in teamfights 60-70? like wut so if someone have the same problem please post comment :)
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