Hi Peter,

As for WCF over MSMQ, the messages it transfers is still WCF format
messages(based on the Binding and configuration you use), MSMQ is used as
an transport layer here. Sure, the message size will become larger since it
contains WCF message envelope, and also has other additional overhead due
to the WCF processing pipeline(such as those message processing stacks at
server and client-side).

There does exists some information about optimizing the WCF over MSMQ:

#How can I speed up message processing when using MSMQ with WCF?
http://blogs.msdn.com/drnick/archive/2007/05/07/optimizing-msmq.aspx

However, I'm wondering whether WCF is actually necessary for your scenario?
If the data transfer doesn't quite rely on the WCF features(such as http
transfer, message security.... ), then you can consider still directly use
System.Messaging namespace classes to do the raw MSMQ programming.  If
instead, you want the WCF service side keep using WCF, and the client-side
sending the raw MSMQ message, you can consider using the
MsmqIntegrationBinding. Here are some reference and examples:

#How to: Exchange Messages with WCF Endpoints and Message Queuing
Applications
http://msdn2.microsoft.com/en-us/library/ms789008.aspx

#SOA'izing MSMQ with WCF (and Why It's Worth It)
http://code.msdn.microsoft.com/msmqpluswcf

Anyway, when using WCF it does add some overheard due to the additional
services/features WCF processing pipeline and message envelope attach.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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