Windows boot waaaay slow since two days ago

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  1. Caledon Ken's Avatar
    Posts : 15,670
    Windows 10 Pro x64 Build 1809

    Same. You need to mark it public.
      My ComputerSystem Spec

  2. Posts : 2
    Windows 10 Home

    Sorry! Please check it again.
      My ComputerSystem Spec

  3. Posts : 404
    windows 10

    @ccardellino, according to your Boot trace, there is a lot of disk I/O, the Prefetcher is not working properly.

    Here is what you can do:

    1. Go to the services and stop the Superfetch service;
    2. Go under "C:\WINDOWS\Prefetch" folder and delete all the content
    3. Restart your computer 6 times, so that the prefetcher can rebuild its prefetching "database"

    Windows boot waaaay slow since two days ago-capture.png
      My ComputerSystem Spec

  4. Posts : 75
    windows 10 Pro
    Thread Starter

    SOLVED for me (the OP). I have not marked the thread as solved because the problem may still exist for others.

    Basically, among various driver fixes, etc., that might have gotten me here sooner, I took someone's very practical advice: "Wait for MS to issue a new update to Windows 10 and see if that fixes the slow boot."

    A few days ago, MS issued an update that installed automatically. My boot time to logon password prompt went from over 2.5 minutes back to 20 seconds.

    In update history, the only one that seems to apply (e.g., is not program specific) is KB4457128 (OS Build 17134.285). Within that, the only detailed note that might be relevant is:

    Addresses an issue that causes the Program Compatibility Assistant (PCA) service to have excessive CPU usage. This occurs when the concurrency of two simultaneous add and remove programs (ARP) monitoring threads is not handled correctly.

    Fromfeedback here, it seemed like my machine was hanging due to an old Intel disk driver. The above note doesn't sound like it. But it's all I found that didn't seem totally irrelevant.

    Thanks to all who made suggestions here.
      My ComputersSystem Spec

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