My Debian 6 install is a default desktop install which had a working internet connection during the installation process. As a result OpenOffice, Java, Mono, extra Gnome themes and icons were all pulled in.
It would be nice if the Debian installer allowed for a more customized 'Desktop' setup.
To cut a long story short, I have no need for Mono and decided to erase it.
apt-get purge cli-common libmono-*
If you are a Ubuntu user reading this, please do not run this command.
Now the interesting thing after performing this action was I noticed my desktop was more snappy and responsive, and more inline with Fedora 14.
Furthermore, I have also experienced the same feel when removing mono from Ubuntu 10.04 LTS.
Mono makes Linux sluggish!