This video provides information on how to find out the bottleneck that could cause slowness in a session run by a quick examination of the Powercenter session log.
Converting and adding of a self signed certificate to use a Webservice Consumer transformation
How to unassign services from an expired key and assign them to a valid key in 9.1.0 and 9.5.1
How to find in which host the Repository Integration service is running in a multi node domain