I have an install of 12.10 and I believe one time when I looked at the system's default start-up applications (the system ones, not user ones) I deleted a few. Ever since it now takes a few seconds (maybe 5-10) before a desktop background appears. It is just black, I can switch work-spaces and the overview shows them all as black except for where some of my start up applications are.
I believe it was something from the systems startup applications that has been removed, anyone got a clue as to what it might have been? and a command to accompany it so I can re-add it?