Presentation layout very slow on mobile

Hi,

I'm trying to use `Crocodoc.LAYOUT_PRESENTATION` with the [slide CSS transitions](https://github.com/box/viewer.js/blob/master/examples/presentations/slide.css) as is used in the [examples](https://github.com/box/viewer.js/blob/master/examples/presentations/index.html). The only thing different that I'm doing is to use hammer.js swipe events to call `scrollTo`.

It works fine in the desktop but when I run it on mobile (iPad 3 with Safari, Android KitKat with Chrome) the transitions run very slowly which makes a poor user experience. When I disable the CSS transitions, it improves, but it still slow.

Do you have any tips to enhance these transitions?

Thanks.