Long load times on first page

Long load times on first page

Everytime a user opens the SD+ first page ( http://server_name:8080/) it takes up to 10 minutes to load, and even I enabled the Active Directory and pass-through Authentications, the login page is displayed. I'm just guessing, but I think this is because our enterprise is connected to other subsidiaries in the world (USA, France, Germany, etc) and I suppose SD+ is trying to find current user's domain. If so, how can I avoid it? Since I just want to work with my domain, I alreay set my domain in the SD+ admin section, but didn't worked.
 
Thanks for your advice.

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