Issue : When you shutdown your xenapp / presentation server it hangs for 5 minutes or more before shutting down or restarting.

Resolution : Try the points listed below.

-Your system might be configure to clear out the page file at shutdown, if it is this will put at least 5 minutes on to your shut down time. To check this do the following

Start Registry Editor (Regedt32.exe).
Change the data value of the ClearPageFileAtShutdown value in the following registry key to a value of 0:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
If the value does not exist, add the following value:
Value Name: ClearPageFileAtShutdown
Value Type: REG_DWORD
Value: 0

-To speed up shutdown / reboot times you could disable windows services. Go through them and disable the ones you dont need.

-Install latest citrix hotfixes and also microsoft hotfixes

-Run a chkdsk on your system

-Defrag your hard-disks

-Is the server out of memory?? The server could be paging to disk and running slow because of this