In some situations, out of our control, the connection to TFS is verty slow. The source control operations take ages to complete.
The problem appears to be network related, since at the same time one computer is very slow executing a source control operation and the others are working at a normal pace.
The TFS client usually connects to TFS using HTTP. The .Net Framework is used to make the connection.
Visual studio has a configuration of the Hypertext Transfer Protocol (HTTP) proxy server to perform the connection.
To avoid a slow speed the proxy must be disabled.
The configuration file for visual studio 2013 is located in
C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe.config
Open the file and add / Update the following entry: