League Client Performance is really bad

hi today i wanted to play league of legends but my launcher is Fuc**** slow af i need to wait 5 minutes to load the launcher and the tabs are loading slow too idk why (Loot,Store,Profile...) when i was in champ select i couldnt chose to ban a champion because the time ran out and i couldnt press anything... when i see the task manager the cpu is being used by 100% this didnt happend yester day or any day just today and i cant play normal this is fu**ing me idk how to fix it is it a bug or what? why didnt this happen before???
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