Why is the first WCF client call slow?

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Usually the first call takes more time because in that call the Channel Factory is instantiated and prepared ready for the communication and that costs time. The created Channel Factory will be cached and reused in subsequent calls and so the time will be less.

http://social.msdn.microsoft.com/Forums/en/wcf/thread/43f89088-546b-46b0-adf8-214deb1741bd

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