Query to webservices limitations, limited to 2 simultanous outgoing connection in .NET
When I developped a webservices-intensive applications, I noticed that the application was limited to 10 connections per seconds, even If the app was multi-threaded, and was asking for more.
The limitation found was that there is (like Internet Explorer) a limitation on the number of outgoing connection to a host, that is 2. The workaround was the connectionManagement configuration node in the app.config, that can be configured to allow more.
After googling a little, I found this article that was describing this limitation and... the way to workaround it 
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MSDN : At Your Service: Performance Considerations for Making Web Service Calls from ASPX Pages
-f.