Severall bugs/annoying things since new patch

I got a few bugs I dont know how to fix yet -Since the new patch my 60 fps dropped onto 30 -My game keeps tabbing out onto my desktop (while typing/rightclicking) -I get a blackscreen for 5 minutes when the game has ended and I clicked continue I really wanna play ranked games but with these things I just cant perform my best I hope anybody has an answer or solution for this because it's only since the new patch! [Edit: The issues are really "bugging" me]

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