Chui just released a new beta of this SNES emulator bringing a considerable speed boost as seen on the video below:
Some more features mentioned: MMU usage for direct access to memory, PVR hardware for drawing SNES tiles, hardware scaled resolution and a separate build with enhancement chips (SDD-1, SA1) support.
For further details and the downloads, check Chui’s SNES4ALL page.
Source: Dreamcast.es