Well, the reason I asked is this. On my A1200, in 256 color mode it runs fine... it's not slow... as far as I can tell it's the decoding of the JPEG image that is slow... and thats probably why the dock is so slow... it uses a JPG skin.
Turning off the dock, and going to 256 colors with no backdrop everything is just as snappy as it usually is.
But I guess thats because it doesn't have to keep redrawing the backdrop when I move the window.