Patch 7.7 Frame drop

I have a very nice computer and have never had problems with League FPS before. Ping is at around 30-50 so it can't be that. Whenever for example a teamfight starts I start lagging like crazy. This is with lowest settings but somehow I can still play BF4 on Ultra without any lagg? Riot, fix this please. Has been around for a few patches I found out when I did some research.
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