A CodePen by foleyatwork. The No Repaint Slideshow - Just experimenting with moving huge slideshow images smoothly. I don't think it's perfect yet (I still miss the 60fps mark at a few points) but it's far improved over other methods I've tried.

There are no repaints but still a few recalculate styles, which can be fairly costly. This is a work in progress, I hope it improves over time. But it's okay now.