Windows 10 2021 February Update - Now 1st sfc scannow SLOW

Stan Kasper 1,376 Reputation points

Updating a number of Windows 10 machines with the latest 2021 February patch Tuesday. All machines very similar. However when I run sfc /scannow after the updates on some it runs ok and on a few it is very, very slow. Do not see the rhyme or reason on the difference. Does anyone know the 'magic' that is happening here in this regard? Very strange.

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Teemo Tang 11,366 Reputation points

    There are many factors can affect the speed of System File Checker, such as network environment, hard disk speed and sectors state, system files or components’ health, the apps which installed and running now…
    Different computers have the different sfc scan time, it is depended on computer’s situation. For current scenario, we should focus on the PCs which cost manty time on sfc /scannow. Check error on hard disk, run dism /online /cleanup-image /restorehealth before sfc.


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  1. Stan Kasper 1,376 Reputation points

    The SFC command completes successfully. And the 1st time it runs very slow but after that it is ok. I have made some minor device changes - Intel Optane/RSAT. I guess the correct response would be to check
    the log files.