Random lag and FPS drops?

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So lately I've been having some MAJOR issues with lag. My general ping range is around 70-120 because I use a wi-fi USB adapter. It's usually not that bad unless my sister starts to take up more bandwidth, but lately it's gotten to unplayable levels for me?

I'm not exactly sure why, but I've been getting HUGE lag spikes lately, jumping up to as high as 4k. Last game, my ping was at a solid 350 for 15 minutes. This isn't normal. I even bought a new wi-fi adapter last month.

I've been checking speed test and the Los Angeles server reads at about 75 ping every time I test it, so I'm not really sure what's going on.

Any solutions to try and fix this? I don't know if it's the game or my internet or what, but it's never been this bad for me before.