I've found out what causes animation lag on my 4th gen iPad. Too many folders on one screen! This causes lag/stuttering when opening apps, closing app windows, using spotlight and even searching in Safari. As I remove folders from a page, the animation gets smoother and smoother. My iPhone 6 has all folders, and no stuttering at all. How do you arrange your apps/folders on your iPad? I've always had my apps grouped together (eg shop, productivity, news etc) but I'm now going to have to rearrange things as the stuttering is so annoying. Maybe I'll think about which apps I use mostly, and have them by themselves on my front page. You?