Office 2007 Documents extremely slow to open from SharePoint 2007
We have had an issue popping up lately where documents were loading extremely slowly when we open them from SharePoint. We did some digging and found a few things, but issue ended up being relatively simple and we confirmed a number of times that the problem was fixed.
Turns out the issue is not Office or SharePoint, but IE. Go into Tools->Internet Options->Connections->LAN Settings and uncheck Automatically detect settings.
This can be done through group policy by going to User Configuration->Policies->Windows Settings->Internet Explorer Maintenance->Connection->Automatic Browser Configuration and uncheck Automatically detect settings.