Group Policy Slow Link Detection Using Windows Vista and Server 2008
Many Group Policy features rely on a well connected network for their success. However, not every connection is perfect or is ideal; some connections are slow. The Group Policy infrastructure has always provided functionality to detect slow links. However, the means by which Group Policy determines this are different between operating systems prior to Windows Server 2008 and Windows Vista.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2008977.