Can someone tell me how the performance in SNES roms on the Axim basic (wm2003) compared to the Advanced.

It runs them slower with sound, but if you overclock it plays almost identical.

use morphgear 2.0.2.2 and above...
overclock it to 472 mhz... try enable the sound

I run PocketNester on my 300 and haven't had any problems with speed. Appears to me to play identical to the originals (although it's been a long time).

It has locked up occasionally though.