What is the holdup on the first WCF call via the serviceProxy?

A common server slowness on start is IIS app pool spin up but in your question you stated that even though the first request was 900 ms, only 16 ms was spent on the server request according to fiddler. If that's true, it suggests something is going on client side One possibility is that some client apps that serialize objects generate and compile serialization code for those data types at runtime, which can result in slow start-up performance msdn.microsoft.com/en-us/library/aa75188... msdn.microsoft.com/en-us/library/ms73390... I'm not familiar with protobuffs but compiling serialization code is trade off which makes the first call significantly slower but makes subsequent calls faster Not sure if that's your initial cost but it's a possibility.

A common server slowness on start is IIS app pool spin up but in your question you stated that even though the first request was 900 ms, only 16 ms was spent on the server request according to fiddler. If that's true, it suggests something is going on client side. One possibility is that some client apps that serialize objects generate and compile serialization code for those data types at runtime, which can result in slow start-up performance msdn.microsoft.com/en-us/library/aa75188... msdn.microsoft.com/en-us/library/ms73390... I'm not familiar with protobuffs but compiling serialization code is trade off which makes the first call significantly slower but makes subsequent calls faster.

Not sure if that's your initial cost but it's a possibility.

The idea to pre-gen serialization libraries produces huge perf gains when using simple XmlSerialization, cause it's so slow and cpu-intensive to begin with. Not so much with protobufs. – AngryHacker Nov 20 at 5:23.

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