When the Meegotouchhome bug is present, this process use between 2-5% of CPU usage ("top" in terminal).

This is not the case anymore once you have moved an icon.

It's a great loss to have lost the thread that dealt with idle consumption issue. Fortunately, we still have as a reference the Nokia Bugzilla DB related to the Meegotouchhome bug:
http://harmattan-bugs.nokia.com/show_bug.cgi?id=486