Lagging in game but ping still fine

I keep having random lag spikes, and when i say that its weird becuase the ping in my game dosent actually increase you can just see the lag. Like abilities will cast 2 seconds later and movement will not turn for a few movements after clicking. I closed almost all background programs except what windows needs to run and made sure no one else was using the internet at the time. I called my cable company and they said everything is fine on their end. What do you guys think? Help please? :(

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