Dotnet 3.5 C# windows from run very slow on Win8x64

First find out what the Problem is.

Where exactly is it "running slow"? Does the Dataretrieveal take long? Displaying the Data? Have you even enough seperation between the two to figure it out?

How much data do you try to retrieve? What type of data? What is the lowest speed of the entire network from the Computer to the SQL Server? Is it taking a proper path? is it perhaps querying the server in your Development Environment because you hardcoded the IP adress?

Retrievale speed for Internet is irrelevant. Webpages are designed with minimum byte size in mind. And even for Intranets, things like Proxies or the normal chaching can speed up the process tremendously.

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Let's talk about MVVM: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b1a8bf14-4acd-4d77-9df8-bdb95b02dbe2