See http://irclogs.ubuntu.com/2009/11/13/%23ubuntuone.html#t17:53 for more info. It sounds like this happens when syncdaemon is working on a lot of metadata. There is supposed to be a bug for optimizing fixing the scanning of metadata but I was unable to find it so I'm leaving this comment on this bug as a reminder. :-)
See http:// irclogs. ubuntu. com/2009/ 11/13/% 23ubuntuone. html#t17: 53 for more info. It sounds like this happens when syncdaemon is working on a lot of metadata. There is supposed to be a bug for optimizing fixing the scanning of metadata but I was unable to find it so I'm leaving this comment on this bug as a reminder. :-)