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1We have VDI in our company (cca. 50 Virtual Desktop Machines / Windows 10 / VMware Horizon View).

I have noticed that on all user machines process explorer.exe is using constantly cca. 20% of CPU (Thread shcore.dll!Ordinal247+0xc0 )

Explorer.exe shcore.dll

When I kill explorer.exe is all ok for several minutes, but then this problem appears again.

We have all latest Windows Updates on our VMs.

UPDATE 01.03.2018. -> Here is Screenshot from WPA for Analyze Screenshot from Explorer Stack from WPA

UPDATE 05.03.2018. -> Here are the settings for Taskbar. Taskbar settings

FIX 14.03.2018. -> Cursor Blink Rate setting CursorBlinkRateFIX

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    analyze cpu usage with WPR(UI) and WPA. Expand the stack of the explorer.exe which has the high Weight (%) Feb 28, 2018 at 15:55
  • Thank you for your answer. I will do this today on one virtual machine and check it... If i would need help, can you please assist me then? I can send you what you need for analyzing... Thank you
    – Marin Loop
    Mar 1, 2018 at 7:22
  • I have done it with WPRUI, but I have a problem with analyzing it... which process makes the problem. Can you please assist me? I have uploaded ETL file - I can send you the link for download. Thank you
    – Marin Loop
    Mar 1, 2018 at 8:54
  • WPA picture shows that drawing 32Bit Icons (in Taskbar?) is causing the cpu usage. what are your taskbar settings (app grouping, small/large icons)? Which win10 build do you use (1607, 1703 or 1709)? And do you use last updates? Mar 1, 2018 at 16:18
  • I have put the screenshot from our Taskbar settings above (screenshot). We are using Windows 10 Pro (Version 1709 / 16299.125). We are doing Windows Update every weekend.
    – Marin Loop
    Mar 5, 2018 at 7:51

1 Answer 1

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Under Control Panel -> Keyboard properties, the Cursor Blink Rate was set on "None" and after we changed it to somewhere in the middle -> problem is gone.

Screenshot of FIX

I don't know how/why, but this setting was problematic by us.

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  • How did you reach the conclusion that this is the issue?
    – user398328
    Mar 2, 2020 at 14:36
  • This has solved my CPU usage issue as well. The symptoms wer identical, the thread view of explorer.exe and all. However, the persistent application notification highlight on the taskbar remains -- interesting that we both have that bug too. This highlight bug, an issue in its own right, has persisted for at least half a year for me, with regular updates.
    – Irfy
    Nov 18, 2021 at 21:25

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