I noticed this too, updated today, installed from Jaunty Beta amd64.
Gnome is unusably slow on a dualcore - sucks up between 50-90% idling
from login onwards - this happens every time I log in to Gnome. The
problem is only with Gnome - Im now running XFCE and everything works
right and smooth,
I confirm this bug on Nvidia FX 5200 as well. I had first installed the new
Nvidia driver 100.14.19 and rebooted, everything worked fine. Then I updated to
newest packages, including Compiz, and I get the same error as people above and
compiz wont start - gives the Comparing resolution