Windows PCs should shut down fairly quickly unless there’s a problem causing a shutdown delay. When you find your computer takes longer to shut down than it usually takes, you may want to make it shutdown faster.
This article describes the method to clear the Windows paging file during the shutdown process, this will prevent file pages from storing unsecured data when the shutdown process is complete.
Using Windows 10, occasionally some buttons, icons, or options may disappear inexplicably, just like in the case above. This is usually more likely to happen after updating or upgrading to Windows 10. But don’t worry if such minor issues occur. Now you can follow this guide to restore the missing Sleep, Shut down, and Restart options back to Windows 10 Start menu