Unfortunately MAME on AGA and 680x0 is very slow. Even with manual tweakings in the source code it is still slow. There are some individual arcade emulators that run better, but they are not as good as MAME. Putting
exec library patch and
BlazeWCP will help a bit, but not much.
Now that AmiMasterGear
sourcecode is available, one may take it and use it for the Z80 based MAME games, but it wil be a lot of work to make these games work. Games like
Hang On Junior will work perfectly with the AmiMasterGear engine.