genesis4iphone is the emulator of Sega Genesis and Sega CD emulator for iPhone/iPod Touch. They will release a new version very soon which improves the FPS and enhance the speed. The video will not be jumpy anymore. And for other emulator including psx4iphone, gpSPhone, and snes4iphone will soon be updated too. The coming next release will enhance the overall performance. The game will then be more playable.

[via ZodTTD]