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Windows 10 1809 Task Manager Processes Tab CPU bug

    Question

  • Today I updated my Windows 10 Pro x64 from 1803 to 1809 (build 17763.1), and spotted a bug in TaskManager.
    It does no longer display the correct CPU usage for processes.
    Can someone reproduce this issue?

    f.e.: running a busy loop in powershell
    while($true){}
    the details tab of TaskManager:
    - displays the powershell.exe process as 25% (this is on a 2 Core, 4 Threads CPU): OK
    - Performance tab display CPU usage of 33%: OK
    - the Processes tab displays 32% CPU: OK, but "Windows Powershell" is only using 3.9%: WRONG

    I already rebooted: this did not fix it.
    Maybe it is due to my system language (german)?


    • Edited by EckiS Wednesday, October 3, 2018 7:28 PM
    Wednesday, October 3, 2018 8:39 AM

Answers

All replies

  • Same bug here (french edition)
    Wednesday, October 3, 2018 12:46 PM
  • Same bug here.  English/US version.
    Wednesday, October 3, 2018 1:57 PM
  • Same issue on my Surface GO after upgrading to 1809. (Canada)
    Wednesday, October 3, 2018 2:45 PM
  • same bug here, I noticed it and it is so annoying, also the CPU is running super HOT, the speed is 2.5GHz, but it is often as high as the speed of 2.85GHz, it never used to do that much, so it is running in turboboost mode alot, is this a bug that will fry the CPUs? ;-) 
    Wednesday, October 3, 2018 4:33 PM
  • From the release notes when the build was released;

    Announcing Windows 10 Insider Preview Build 17763

    Known issues
    Task Manager is not reporting accurate CPU usage.

    • Marked as answer by EckiS Wednesday, October 3, 2018 7:28 PM
    Wednesday, October 3, 2018 4:36 PM
  • that was for Insider build.
    But they released anyway...

    speechless

    Wednesday, October 3, 2018 6:40 PM
  • Same bug here every program usage is stuck around 3.7%.
    Wednesday, October 3, 2018 6:49 PM
  • that was for Insider build.
    But they released anyway...

    speechless


    'Windows 10 is like a box of chocolates...'
    Wednesday, October 3, 2018 11:31 PM
  • Same bug here (Spanish edition (MX))
    Thursday, October 4, 2018 5:41 PM
  • same bug here, I noticed it and it is so annoying, also the CPU is running super HOT, the speed is 2.5GHz, but it is often as high as the speed of 2.85GHz, it never used to do that much, so it is running in turboboost mode alot, is this a bug that will fry the CPUs? ;-) 

    This appears different to this thread, could be

    Windows 10 update history

    Intel Audio displays an intcdaud.sys notification. Microsoft and Intel have identified a compatibility issue with a range of Intel Display Audio device drivers that may result in excessive processor demand and reduced battery life.

    Thursday, October 4, 2018 7:05 PM
  • Same bug on English version 64 bits.

    As a work-around you can use Process Explorer from www.sysinternals.com suite, also a Microsoft product by Mark Russinovich.


    Regards, Edwin

    Thursday, October 4, 2018 11:15 PM
  • reproducable in french version of Windows, even after KB4464330 (build 17763.55).

    Note that bug occurs in "task manager - processus":

    but not in "task manager - details":


    Michel


    • Edited by Michel.D Saturday, November 3, 2018 10:59 AM
    Saturday, November 3, 2018 10:58 AM
  • seems to be solved by KB4467708 (although it is not explicitly mentioned by Microsoft in

    https://support.microsoft.com/en-us/help/4467708 .

     

    Michel

    Friday, November 30, 2018 2:18 PM
  • /imgur.com/a/eDxwX7x
    Saturday, February 2, 2019 12:10 AM
  • I don`t know when did this issue started to occur. But i have noticed showing CPU 100% when OPENING Task Manager ONLY, it would be there for a second or two and after that it goes back to normal values Power usage from very high --> high --> medium --> low.

    Sometimes it shows also System Interrupts 100%, for a split second and after that works normally.

    Under performance on the charts it never reaches 100%. 

    I cant say after what update exactly it is. I personally don`t have any performance issues, I run a clean boot ( boot time 3 - 4 seconds), I tried updating drivers and everything not to be a hardware/malware issue, but it is not.

    My system: Inspiron 17 Dell 4578, I7 4510u 2.00, Nvidia 840M, 8 Gigabytes Ram, Windows 10 64 bit Pro.

    Os build: 

    17763.292



    OS Build 17763.292
    Saturday, February 2, 2019 12:15 AM
  • starting TaskManager: CPU starts with 40% on my system, quickly drops.
    I guess that is in indeed Task Manager itself using so much for collecting data,
    so not a bug.
    Saturday, February 2, 2019 7:08 AM
  • this thread had been created to document a bug introduced by first version of 1809:

              "task Manager is not reporting accurate CPU usage"

    This bug has been solved by Microsoft in november. It is solved in 17763.292.

    Now, CPU usage displayed by Task Manager is correct. Thia thread could be closed.

    ___________________________________________________________________________________________________________________

    What you see is totally different. When you run "task manager", you can see immediately an important CPU usage for "Task Manager" itself (on my PC, about 40% during a very short period of time), then, it decreases (on my PC, about 1%). This seems absolutely normal: if you start any application (chrome, edge...), you have the same result).

    What Task Manager may show you is that an important percentage of CPU is used by processes you have not explicitely started. Use "details" screen instead of "processus" screen, sort by CPU usage (click on "pr"), and you will see that processus such as dwm.exe, runtimebroker.exe, svchost.exe,... are active, and consume some CPU time. 


    Michel

    Saturday, February 2, 2019 11:10 AM