An interesting update to this thread.
I posted a message to the forums on the Macromedia site, and it got picked up by someone at Macromedia. Anyway, after sending him the contents of a few log files, it looks like he's traced it to a bug in the ColdFusion client variable purging system. Apparently there are bugs in this that cause connection leaks and it's slow which can cause a backup of requests.
There is a hotfix for this at:
http://www.macromedia.com/support/coldfusion/ts/documents/client_purge_hotfix.htm
Apparently this wasn't included in the Updater?
Also, there is a bug in the hotfix (!) which appears to mean that client variables are not deleted at all. This is to be fixed by another hotfix in the next few days but I am told it is better to apply the original hotfix in the mean time.
So, if you are getting unexplained surges in CPU on an hourly basis (hourly from when the service is started) then this could be your problem.
Ian
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