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That really depends on so many other factors that it's difficult to make a proper comparison. Let's just say that Mesa supports accelerated rendering on Linux through DRI, and it's more than fast enough to run Quake 3 in 1600x1200 and everything maxed out on a Radeon 9800 Pro. If you use Mesa unaccelerated over a remote X11 connection, it will be horribly slow. The speed really depends on the backend.