In this demo I'm noticing a significant performance hit / choppiness when the animation first runs (click one one boxes). After that, every subsequent animation runs much smoother. I've noticed similar behavior in other projects when I'm manipulating the dom using tween max.   Any ideas what can cause this / how to make it go away?   Running this on a new macbook.   Thanks. See the Pen OxKMbj by zadvorsky (@zadvorsky) on CodePen