it renders pretty smooth.... and i think the reasons are:

- he doesn't use opacity/transparency
- he doesn't use shadows for text and bubbles
- he doesn't too much modification of bubbles, avatars and content



so... if you remove transparancy and shadows from my version it would scroll much smoother too... but wouldn't look as cool as it does now *laugh* XD

btw: your layout looks nice and clean pretty cool @ niqbal