Yet again a new patch and another huge FPS drop

Hello, i've recently started to notice that every patch that gets realised the worse it gets for my FPS, from 8.15 it started i was stable at 400 fps, then at patch 8.16 it droped to arround 300- and from 8.17-8.20 My fps is now 30 in team fights.. i cant barely move or anything now, the longer the game goes the lower fps i will get. And if i even open up the shop my fps goes down to 20-15 ish.. and ive tried everything, reinstalling league of legends, clean my pc up, update to the latest software and so on, still nothing improves. In other games my PC runs fine. but at league its bad. any suggestions? Pc Spec: Graphics Chipset AMD Radeon R9 200 Series 3072MB Core Clock 933 MHz Windows Version Windows 8.1 (64 bit) System Memory 8 GB CPU Type AMD FX(tm)-6350 Six-Core Processor Asus 24" LED FreeSync MG248QR 144 Hz In game settings: Resolution: 1920x1080 Window mode: Fullscreen Char quality: Medium Environment quality: Medium Effects quality: Medium Shadows: Off Char inc: Off Frame rate: Uncapped Anti-Aliasing: Check Vsync: Unchecked.
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