Performance drop since the new patch

I'm experiencing a major performance drop in-game, to the point where I can't even teamfight. I'm not sure what causes the issue. But it's been happening since the latest patch. Before patch avg. FPS: 100 (Capped to 100) After patch avg. 50 (goes down to 20-30 in teamfights) My computer is perfectly fine, it's a (somewhat) fresh install and I haven't had problems before the patch. Anyone else experiencing this?
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