Freeze and FPS drop patch 9.20

Since the last patch I keep having freeze in my client, even during champions select, and random drop of fps while playing. I'v tried to run the client in the lowest settings possible, closing it and the new launcher during my games, but it doesn't change anything. I really wanna play some more ranked before the end of the season but I already know that I'll get too tilted and start ruining games for my teammates. plz help
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