Comment 10 for bug 324292

Great that the fullscreen issue has been solved. I suspect the general performance issue is pretty general and not specifically related to Eschalon. The ubuntu X developers are looking at ways to optimize the performance, but unfortunately it looks like it's a choice between speed and stability/corruption in general. On some chipsets, though, the problems may not appear, while the performance may increase.

You can try to set
        Option "AccelMethod" "UXA"
in the device section of your xorg.conf and see if it improves performance. There is some ongoing reporting at https://wiki.ubuntu.com/X/UxaTesting , and the current results for 945GM is not overly positive. It would be nice if you could add your experience there as well.