WCF is slow when reliable session is ON and with burst async request

Question

For experiments, I created a simple \"Hello World\" WCF service and client using .NET 4.5 on VS2012. The server is hosted on a console application and use net.tcp binding. I

Answer 1

You are sending messages Async, but you have ordered="true" on the ReliableSessionBindingElement. This doesn't make sense. Set ordered to false, since it makes more sense for your scenario. ReliableMessaging will cause a performance hit because it adds to every response message a SequenceAcknowledgement. It also adds overhead of CreateSequence/CreateSequenceResponse and CloseSequence/CloseSequenceResponse, then TerminateSequence/TerminateSequenceResponse message exchanges at the beginning and end of your session.