Lags after new Winter Patch 7.24

Hey, I'm having problems with the new patch that just came out a couple days ago. The whole game is not running smoothly anymore, starting with the loadscreen. The little wheel on the bottom right is not turning smoothly, just like the percentage of the players loading amount are lagging. Ingame it feels like the Screen is flashing because the game is not running smoothly. I had about 120 FPS constantly before the Patch and now I have like 40 in Teamfights. I have tried repairing the client, and I also tried the new Hextech Repair Tool, it both didnt help. Please help me fix this, since it makes it pretty hard to even play a game with lags like that.
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