My Duron 900 still gets sound/performance problems with anything after 0.8.8R8, and so did someone else with a 1.4 Thunderbird.
It's not a processor power issue that is causing these problems....................
One day I might be able to upgrade from 0.8.8R8 but not anytime soon. Amigas must be a real arse to emulate due to there complex nature, as the Megadrive/Snes/ST etc emus seem to have less problems.
Still, it's free software so I can't complain - just glad I've got a real Amiga