|... take a look in "Event Viewer"|
... you can start the Event Viewer in Windows using the keyboard shortcut [Windows R], typing [eventvwr.msc]
and hitting [enter].
... Navigate in the Event Manager using the menu on the left side using the following path:
Applications and Services Logs> Microsoft > Windows> Diagnostics-Performance > Operational.
... This will lead directly to the location that contains performance diagnostics not only for the Windows shutdown but also for standby and boot performance issues.
... a good way to start is to sort the columns by Task Category. Click on the Task Category title and look for
Shutdown Performance Monitoring entries.
... Posting is provided "AS IS" with no warranties