gtk-update-icon-cache -f /usr/share/icons/THEMENAME/
Replace the THEMENAME with the actual icon theme set you are using. The default is ‘gnome‘.
echo gtk-menu-popup-delay = 100 >> ~/.gtkrc-2.0
Gnome also hogs resouces my animations that are barely noticeable.
To enable these resource saving features open gconf, from terminal:
from there go to:
/apps/metacity/general and check on reduced_resources
/apps/panel/global and uncheck enable_animations
/desktop/gnome/interface and check off the box for accessibility
The other less known issues are compcache / ramzswap and clamd.
Ramzswap uses physical memory as swap space thereby causing memory lock-ups. It is vestiges of the Live-CD which requires this feature when no swap space exists on the HDD. But once installed this should be removed. Unfortunately, Ubuntu does not bother to do that my default. To temporarily disable ramzswap
sudo swapoff /dev/ramzswap
To permanently turn it off the compcache had to be dealt with. See here - http://odzangba.wordpress.com/2009/10/12/how-to-disable-compcache-and-fix-swap-errors-in-ubuntu-9-04/
Clamd runs as perpetual daemon. It could be seen by lsmod. Remove it by rmmod clamd. Clam AV is actually inteded to used on mail servers for scanning incoming mails. It is better to uninstall it locally.