Installing & searching for updates is slow & high CPU usage occurs in Windows 8.1...

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Link: Installing and searching for updates is slow and high CPU usage occurs in Windows 8.1 and Windows Server 2012 R2

 

...Issues that are fixed in this update

 

Issue 1

 

When you install Windows updates by using System Center Configuration Manager, the installation takes a long time to complete, and System Center Configuration Manager becomes overloaded.

 

Issue 2

 

The Svchost.exe process takes 100 percent of the CPU usage when you try to upgrade to Windows 10...