Input lag?

I've felt as if ever since late 2015, I've had some sort of input lag. League feels sluggish despite perma 250+ fps and 30-60ms ping. I can't tell you the exact moment this happened but I sort of grew out of league in s4 so I haven't been playing frequently enough to care but I want to get back into the game. I'm just having this problem. Has anyone experienced this/has any solutions? Any help is appreciated.
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