Slider thumb lags a lot

I've been working on a slider in S2 and cannot get the thumb to respond properly. It lags terribly when I publish my product. I've changed the design of the slider several times, changed the way the slider works from layers to states, and I cannot figure it out. I even deleted the slider and built a new one. I asked a coworker to look at it and she couldn't figure it out either. What am I missing? Please help.

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