Ping issues only with in League

Hey! I've had weird ping issues lately which only occur while playing LoL. Ping is jumping around 500-2000ms in-game, and I'm getting huge lag spikes frequently. The ping problem occurs only in League, since speedtests look normal while in game. I've ran HRT and tried repatching, checked firewall setup, and basically everything I've figured to try out. I'm playing with OS X 10.12.6, and the network is through wi-fi.
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