PSP298 has updated his port of VisualBoy Advance to the PSP Console, heres what he said at the release thread:
Change in v1.1
- Speed increase, how much, try it and see it yourself
- Add 240x160 screen mode
- Add vsync on/off, can speed-up a little bit for some game
This is a very cool realease guys. I dumped the rom from my bubble bobble old & new cart (including sram) and it was VERY playable (without sound) on frameskip 3 at full screen.