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Windows Server 2012 R2 Essentials Very Slow During/After Monthly Windows OS Updates

We have a Dell server with the Windows Server 2012 R2 Essentials operating system. The server has worked very well for several years. However, now, when the monthly Windows operating system updates are installed, the server becomes extremely slow. This is true both with the OS update process (takes forever, which was not the case in the past) and with the server speed after the update reboot has been done. Server speed does improve over time after this slowdown. Is this a known problem? Could the cause be the loss of cached memory contents when the server is reset? Or is it possibly a temporary disk drive problem (RAID-1 on server)? It has gotten to the point where we are afraid to install monthly OS updates, due to the marked slowdown.

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Hypercat (Deb)

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John N

ASKER

Thank you for your comments. I did want to view the Task Manager during the slow parts of the update process. The problem is that even when the server is back to the desktop, I am unable to even load the Task Manager (the server does not respond to either mouse or keyboard input, very much like the case of a computer with exhausted resources). Those resource-hogging processes/services must gradually relinquish resources (CPU, memory, disk drive) because the server eventually attains its original speed again (but not for quite a while, unfortunately).