Windows Explorer, recently updated, now hogging CPU and slowing system


  1. Ursa Max
    Posts : 1
    windows 10
       New #1

    Windows Explorer, recently updated, now hogging CPU and slowing system


    Summary: system bogs down when any windows are opened using Windows Explorer (recently automatically updated, 8/28/2019 version 10.0.18362.267). Details follow.

    The icons in my taskbars recently started flashing intermittently and it seemed that my system was slowing down. I followed some directions related to flashing icons on this site and at a MS site. These included running sfc /scannnow. Later running DISM.EXE. (full string was DISM.EXE /Online /Cleanup-image /RestoreHealth). Neither resolved the issue. The DISM was bit scary since afterward the system message was "preparing Windows 10" for quite a long time.

    I've removed all attached devices. I'm using a Lenovo Carbon X1 and suspected a connected device might be the culprit. Rebooted the system twice without any connected devices. No change.

    It seems that as I open more folders, the system slows and the icons flash or disappear entirely.

    Next clue. Opened task manager and found that with few programs open, my CPU was 100% occupied. Found that with any windows open, Windows Explorer using more than 60% of overall CPU. Closed Windows Explorer windows, now at 0% CPU time, and CPU is now at 4%.

    Windows Explorer was updated on August 28, 2019 at 2:18PM. There are no other versions shown, so I couldn't revert back to a newer version. Any ideas?
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  3. AndreTen
    Posts : 30,613
    Windows 10 (Pro and Insider Pro)
       New #2

    Hi and welcome to Tenforums Ursa Max

    10.0.18362.267 is Windows version after July Cumulative update. There should be some more updates.

    Since you've already taken some essential steps like sfc and Dism, guess that won't help. DISM should be executed in theese steps:

    Open administrative command prompt and run:
    a) dism /online /cleanup-image /scanhealth
    b) dism /online /cleanup-image /restorehealth
    c) sfc /scannow
    d) chkdsk /scan
    I would download the latest ISO (your lang., etc) and perform Repair install with an In-place Upgrade

    Edit: and what is Task manager saying about programs using CPU at the time of slowdowns...
      My Computers
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