detz wrote:
you only have to look at how poor the simple scrolling banner scrrensaver works to realise that windows can't move graphics about smoothly
I imagine the screen saver is just badly programmed.
Take a look at a 3D game. Given that any reasonably modern PC can render full 3D environments at hundreds of frames per second, then even if you did scrolling text by rendering texture mapped polygons in 3D, it ought to be perfectly smooth. In general, any 2D game can be done using 3D hardware, so the possible performance should be at least as smooth as what you see in a 3D game.
Now having said that, I don't know well UAE performs at AGA emulation, but it's simply not true to say that "Windows can't move graphics about smoothly".