When was the last time you were writing an email and had to wait for the screen to update?
Just yesterday, in fact. I'm using Gnome and Evolution on my desktop, and I've been using XGL/ Compviz with Nvidia binary drivers. Recently I switched back to the open source nvidia X.org driver, because of the X 7.1 update and a -mm kernel.
The speed difference in screen updates is massive. The open source driver is painfully slow. Scrolling a gnome-terminal takes more CPU time than the compile process creating the output. Switching email messages in Evolution lets me watch various bits of the screen update.
I can hardly wait until Nvidia updates their driver for X 7.1 and I can switch back.
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