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Some are slow, some are okay, and none are responsive and quick. Madbomber! was okay and there are other okay SDL ports. But none that I've tried are speedy.

I think that's a handicap for programs using SDL and similar libraries. It also goes against MorphOS' great strength of responsiveness.

However it should be possible to get a good result out of SDL for apps and certain styles of games.

If you're bummed out by not-fast SDL ports go try AsteroidsTR which definitely doesn't use SDL.