Yes, it is. Of course, all sorts of other things might contribute. Upgrades to the kernel, GNOME, major applications, the compiler, or even changes to compiler flags used could have helped.
Well then this isn't specific to Ubuntu at all then? Any distro that recently upgraded to 2.6.29 and the 1.6 Xorg will be experiencing the same benefits?
Are you aware of any good objective measure of interface "snappiness"?
No I guess not,
But if the article writer had at least put some hypothesis into why the "snappiness" had increased it would have been a much better read, for me anyway, I guess I can agree that the user experienced speed improvements can be of some benefit.