Lag, much lag

So when I get to play a game of league i open the client and play, and when i get into my game, everything is completely fine. High fps low ping and everything is great. The thing is when I get out of my game, my whole pc starts to lag, it happens even with remakes... I cant play and i need to restart my pc before playing another game. Is it a problem on my pc or with the launcher? Any help would be highly appreciated!!!
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