PLEASE help... I can't play League because Kernel Task uses too much CPU (Mac)

_please don't just say the old joke "don't play on a macbook", or at least be helpful afterwards... thank you_ I used to play League on a really bad old Macbook and it was fine. When I upgraded to the new Macbook Pro a few months ago (I use Apple for work reasons), even though it's supposed to be so much better, the game will randomly lower the FPS down to 15-10 and I see my activity monitor like the picture I attached. This started after patch 9.11 but I don't know if that caused it. I'd appreciate any help a lot. Thanks so much
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