My XMas Bonus game oringally drew the entire screen, but it could drop frames on a <2GHz Machine so I changed it all to a dirty rects system and it now works on a 500MHz system. In the Amiga days you had to redraw changed areas only as they weren't powerful enough to do the whole screen whereas PCs are, but only modern ones really. If you are making a scrolling game you may have to redraw it all each frame anyway. Only updating changed areas is hard, especially as there are two buffers in full-screen mode and only one in windowed mode.
Simple speed question...
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