On my iMac G4 1GHz with an Nvidea Radeon 4MX gfx card, a routine using images ran at least around 10 times faster than the same routine using pixmaps. That's because that computer has hardware graphics acceleration. If the computer it's running on only has software OpenGL, likelyhood is that pixmaps may be slightly faster than images. That's mainly because pixmaps can't be drawn with rotation or scaling, they are drawn as rectangular areas only, so may be faster than drawing a similar non-rotated non-scaled image. But if you have hardware graphics acceleration (which not all people do), Images are definitely a lot faster (like I said, about 10 times here).
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