Well if that's all the improvement anyone ever sees, it would be very hard to see a difference at all. That's why I think we're missing some case. 

If you're making DOM changes that potentially force layout more than once per frame (e.g., triggered by a scroll or mousemove event) you'll want to limit that using `requestAnimationFrame` or some other method, see [this article](http://www.html5rocks.com/en/tutorials/speed/animations/).