Скачать или смотреть Windows 10 Fast shutdown.

Windows 10 Fast shutdown.
Right click on a free location on the desktop and select New Shortcut.
In the location field, type the following command: %windir%\system32\shutdown.exe /s /t 0

Click Next to continue.
Name the shortcut or keep the name. This is the icon description that appears
underneath the shortcut on the desktop.
If you are running Windows 7 or newer, you may pin the shortcut to the taskbar.
This may be useful if you want a clean desktop, don't display desktop icons by
default, or prefer to use the taskbar for important activities.

Tip: You can assign a keyboard shortcut to the shortcut to run the command
from any location on the system. Right-click the shortcut on the desktop
and select properties from the context menu. Locate the Shortcut Field,
click on it and pick a shortcut for it that you want to use, for instance
Ctrl F11 or any other shortcut that you are comfortable with and is not
mapped by Windows or programs already.

In case you are wondering what the parameters mean:

s means shut down the computer.
t defines the timeout period before the shutdown which in this case is 0 seconds.
Since you can map a shortcut to the operation, it is definitely the fastest option
available to shutdown a Windows computer.