Visual Studio TFS very slow

It so happens that in Visual studio, the connection to a TFS server is through a possible proxy server. (A default one)

 

If you VS is slow to take TFS,

go to the

Visual Studio 10.0/Common7/IDE/devenv.exe.config file

go to the bottom

locate <system.net>

and add

    <system.net>
    <defaultProxy enabled="false" />
        <settings>
            <ipv6 enabled="true"/>
        </settings>
    </system.net>
    <appSettings>
        <add key="TestProjectRetargetTo35Allowed" value="true" />
    </appSettings>
</configuration>

this will stop it from looking for your TFS server on the internet