Comment 33 for bug 215194

For CalDAV users, with recent nightlies there are two preferences that you could set, calendar.debug.log and calendar.debug.log.verbose, that will significantly increase the amount of data being logged; that might help getting to the bottom of this. Also, as Kai suggested in comment #17, it would be useful if someone could wireshark a machine with this problem to see if there is network traffic associated with the CPU load. His question as to platform is also a good one - does this happen on Windows only?