Im doing some tests with the RC2 made by Cluster:
Test Results:
Chrono Trigger OK
Demon Crest OK
Megaman X2 OK
Super Double Dragon OK
Terranigma (No sound and doesnt pass the first intro screen)
The solution for the mame 2003 speed issues:
go to settings > frame throttle and set 'maximum run speed' to 1.0
Tested on Xain´d Sleena and works like a charm.