Windows Slow Shutdown

Make Shortcut shutdown.exe -s -t 00 -f
chkdsk /r /f /x
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\ClearPageFileAtShutdown set to 0
sfc /scannow
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
restore health not work Win7
Try System Update Readiness Tool
Reduce some closing time setting in registry or use Windows Ultimate Tweaker
(Should not go below 2000)

Ongoing . . .
I did may of these at once plus installed an old video card to handle the two monitors instead of using the Intel onboard adapters. It drops like a rock when closing, even when using standard shutdown. It took forever before. Who knows which ones worked.

Winaero Tweaker can add Shutdown on desktop context menu among other shutdown options.