FPS Drop , and freeze there.

Hi there guys, so my problem its that i have a hard time playing league, from 150-160 fps to 70-80 fps and its staying there for good seconds or freeze there and i need to close and re-open league again and after some time its start again ? Can somebody plase tell me whats its going on ? and no isnt from my pc i have a gaming pc and in other games i dont have fps drops or bad fps, i think its from the game thank you guys {{sticker:slayer-pantheon-thumbs}}
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