Changes

; Do you have any suggestions on ways to architect our apps/tests to take advantage of APZ? [2014-01-28] : I think I've run into a few apps on B2G where the body element is not scrollable but all the scrollable content lives inside another overflow:scroll div. (I think this might be the case in the settings app, actually). This is undesirable because while we ensure the body's content is always layerized and ready to scroll right away, other scrolling subdocuments may not be. This is required to prevent allocating massive amounts of memory. What happens is that as soon as you start scrolling the subdocument it will be layerized and you can scroll it async, but there is still a small latency involved. I think Chris Lord filed a bug about this for the settings app. Other than that, just minimizing the number of paints would help - try to use animations and such that can be done in the compositor as much as possible (BenWa can provide more info on this if you need it).