FPS Issues since 7.22

So ever since patch 7.22 the game starts off normal with the usual 100+ FPS but after around 20 minutes of play time FPS drop to below 20 in fights. This is is damn annoying, these issues have been present for over a year now and there was no fix? I mean, even high end gamer PC's can't seem to run league with stable 144FPS. Before some one asks... yes, I did update my drivers, been in contact with the player support(they claim there are problems (which been there for months now) with AMD FX CPU'S which cause the drops)..
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