When loading large Stores into Lists, I've noticed that the user experience degrades rapidly in my application if the item count is > ~500 items. When loading these stores into a desktop PC webkit browser, these Lists give a marginally passable user experience. On a mobile device, e.g. a Droid X phone, it's completely unresponsive.
I expect rendering long lists is a common need amongst Sencha Touch developers. Is anyone else struggling with this issue? If so, how are you dealing with this problem? Pagination feels like a non-starter, as it would eliminate the possibility of using an alpha bar, which is a key UX component of a long, alpha-sorted list.