From watching videos of JooJoo, UI latency and scrolling performance look awful.
That would save significant battery life (which we haven’t heard anything about) and really kick ass at performance.
Offloading rendering to the GPU also frees you up to, oh, say, reliably detect touch input events.
System on Chip GPU + CPU combos are fairly inexpensive parts these days. Even with a GPU as simple as the first gen iPhone PowerVR MBX lite would’ve had reasonable performance.
UI latency and scrolling performance make all the difference in multi-touch form factor devices. A true multi-touch contender needs to get this right.
I just realized that JooJoo plays video smoothly at 1080p. So they definitely have a GPU or DSP in there. They’re so close, they just need to get the software up to snuff, maybe with Clutter?
More Reading: On Mobile Phone OS Design and GPUs