I am developing a WPF application that talks to a server via WCF services over the internet. After profiling the application I noticed a lot of time is being taking up by creating the appropriate WCF client proxy and making the call to the server.

The code on the server is optimised and doesn't take any time to run yet I am still seeing a 1.5 second delay from when a service is invloked to it returning to the client.

A few points to give a bit of background:

• I am using the ASP.Net membership for security
• I will eventually hook into the same server side code through a website
• I would eventually like to have offline support in the application

I really need to nail the performance early though as if the app is taking a couple of seconds to come back it is too long for what I am trying to do.

Can anyone suggest performance tips that will help me please?