Why does it take 10 seconds to Activate a code window for Web.Config?

I have an add-in to Visual Studio for printing the source code in color. A user gave me a CRM project to test the add-in. The project contains many web.config files. The Add-in opens the project Item and then Actives the code window as follows to take  RTF copy of the code in the window:

 Stopwatch.Start()

 window = projectItem.Open(Constants.vsViewKindCode)

 ts = Stopwatch.Elapsed
 elapsedTime = String.Format("{4}; ProjectItem.Open(); {0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10, projectItem.Name)

 Diagnostics.Debug.WriteLine(elapsedTime)

 Stopwatch.Start()

 window.Activate()

 ts = Stopwatch.Elapsed
 elapsedTime = String.Format("{4}; Window.Active(); {0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10, projectItem.Name)

 Diagnostics.Debug.WriteLine(elapsedTime)

The trace below shows that open takens no time at all but the .Activatetake 10 seconds: This behavior is only peculiar to some .config files!

Why is that and how can I avoid the delay?

Regards,

Joginder Nahil
www.starprinttools.com