Xfce - multiple xfdesktops running. Huh?

[OneSalientOversigh]

I run Xfce. After upgrading to 9.04 I have found things have slowed down slightly. I checked the system monitor and this is what I found:

[img width=400 height=320]http://static.zooomr.com/images/7374054_ac803002e4_b.jpg[/img]

Link to bigger image

Multiple Xfdesktops running. Is this normal?