Terrible lag spikes since 5.1 (tested)

I had been having absolutely brutal lag spikes recently and I was curious about the cause. Nothing else on my network was lagging and it was only league so I did some testing. My Windows desktop goes from around 100 ping to 1000+ periodically throughout the game but I wasn't having similar issues in other games. I just installed league on my Macbook and there is zero lag. So to conclude on my Windows machine since 5.1, only league is lagging as other games and my web browser have zero issues. And its not my network nor connection as both machines are on WiFi and the laptop receives zero lag spikes.
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