Low FPS on High End PC

I know there are a few threads on this but nothing works. My Specs: gtx 1080 i7-8700k 16gb ddr4 ram I usually get around 100-80 fps ingame which feel like a lot worse than 40 and sometimes it drops to 50-70. Please dont suggest me the frame skipping article because capping my fps to 60 just makes it alot worse and i never used movement prediction. The Task Manager shows that my GPU and CPU run on 10-20% workload and League is getting 1,7gb Ram. In some rare occasions i have 300-400 fps but then after a short time its back to "normal". Im actually really annoyed that I paid a lot of money just to buy a PC on which LoL runs worse than on my laptop so if anyone gives me a working solution for this problem i will give him 10 bucks on paypal

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