@Robert: You can simply try this sample app:
Just scroll through the lists, switch tabs, select items...
On Android Transformer / With high resolution in Chrome on a non-high-end desktop PC:
- no animations (sliding / tab switching)
- no smooth list scrolling
- you can watch parts of the page appear bit by bit when switching the tabs at the bottom
These are the same symptoms we notice in our own application when using Sencha Touch 2, while it works fine with Sencha Touch 1.