I tried using a different rom (quadra), but it made little or no differenece. I was using LC III. The OS is running smoothly, but processing is slow, on 2-4 colors, however 256 (for running games) is just completely unusable. About 1-5 fps. I remember getting great results with 060 and RTG, having no problems running Settlers II or similar games, but off course I'm not surprised there is a big difference to 030 AGA.
I would love to get some older games running tough. Finale (for musical notation. Of which there are no good alternatives on 3.x) seems usable, which is good. It runs in two colors and quite smoothly.