On that note, two things. First, when you actually start the animation, make sure that the images are loaded first. If I hit one the demo sites with a cleared cache, the images pop in pretty bad. Use document.onload instead of $(document).ready

Second, mobile performance is dreadful. From what I understand, you have it using CSS3 animation and simply add animations into divs. My suggestion would be to default to javascript on mobile. Most mobiles don't have css animations optimized as heavily as javascript animations.