What Joe said. Some cards (like the Voodoo 3) have 0 performance loss when combining 2D and 3D. Others will have a lengthy state change which will kill FPS instantly. If you are aiming for the shareware market, I wouldn't do it. Otherwise, there is nothing really to worry about, as later cards don't suffer from slowdown at all.
Mixing 2D and 3D - what's the problem again?
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