Steps to Reproduce

1. run the attached zul
2. open developer tool
3. click "fill" button on server mvvm and client mvvm
4. observe the timing of listitems appear in a browser

Current Result

• server mvvm: although it takes a longer server execution time, it renders the first 50 items very fast, the rest items are just empty listitems. So an end user can see the result faster than client mvvm.
• client mvvm: it takes a shorter server execution time, but an end-user never sees any listitem on the screen until it finishes rendering 2000 items. So from a user point of view, he thinks client mvvm is much slower than server mvvm.

Expected Result

client mvvm should follow the similar rendering behavior to render partial items first, to give end-users a quick response