3D cannot be essential to
users of older hardware, since it turns their hardware into unresponsive mush.
How about visually impaired people? Compiz and the zoom plugin *are*
essential to them.
A friend of mine has an old computer, which is « turned into
unresponsive mush » by 3D, as you say. But at least, now he can read
what's on his screen, and thus actually use his computer. ;)
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Mathieu Bridon (bochecha)