I have a brand new Windows 7 Dell laptop, imaged, with very few apps and Symantec EndPoint protection.
It's part of the domain.
Takes 5 mins for "Logging off" process to finish. No matter what I do, Log Off, Shutdown, or shutdown -r -f -t 01 command, it takes about 5 mins for Logging off step to finish.
I went into Performance, Information and Tools and do not see any warnings.