Clean your registry with gconf-cleaner

This is a neat way of cleaning the gnome registry, useful after an upgrade or if you simply want to speed up the machine.

apt-get install gconf-cleaner

Remember to first back up in case anything goes wrong:

cp -av ~/.gconf ~/.gconf-backup

run gconf-cleaner

It showed about 1200 keys in my system that could be cleaned.

Yes to all.

Check this tutorial out, great visuals:

http://www.linuxinsight.com/how-to-cleanup-your-gnome-registry.html