If you use roaming user profiles on your network and your users are finding it takes them an inordinate amount of time to log on, it may be because they have a lot of files in their My Documents folders, which by default is part of their profile. To resolve this issue, try redirecting each user's My Documents folder to a shared network folder that is not part of their roaming profile.
If you follow this approach, be sure also to configure each user's home folder setting in their user account properties so that it points to their redirected My Documents folder. This may be necessary if users are running applications that aren't designed to work with folder redirection.
Mitch Tulloch is President of MTIT Enterprises, an IT content development company based in Winnipeg, Canada. Prior to starting his own company in 1998, Mitch worked as a Microsoft Certified Trainer (MCT) for Productivity Point International. Mitch is a widely recognized expert on Windows administration, networking and security and has written 14 books and over a hundred articles on various topics. He has been repeatedly awarded Most Valuable Professional (MVP) status by Microsoft for his outstanding contributions in supporting users who deploy Microsoft platforms, products and solutions. Mitch is also a professor at Jones International University (JIU) where he teaches graduate-level courses in Information Security Management (ISM) for their Masters of Business Administration (MBA) program. For more information see http://www.mtit.com.