Windows 10: Windows Defender using 47% of CPU consistently

Discus and support Windows Defender using 47% of CPU consistently in Windows 10 Ask Insider to solve the problem; Hi everyone, thank you for your time, my Windows Defender always is using 47% of CPU sometimes even more, it makes my PC fans louder and it worries... Discussion in 'Windows 10 Ask Insider' started by /u/ImWolftom, Sep 24, 2020.

  1. Windows Defender using 47% of CPU consistently


    Hi everyone, thank you for your time, my Windows Defender always is using 47% of CPU sometimes even more, it makes my PC fans louder and it worries that can damage my CPU in a long-term situation, I tried almost everything, even reinstalled Windows, I truly don't know what to do Windows Defender using 47% of CPU consistently :(

    submitted by /u/ImWolftom
    [link] [comments]

    :)
     
    /u/ImWolftom, Sep 24, 2020
    #1
  2. armycyrus Win User

    AppleMobileDeviceService.exe consistently takes 50% of CPU usage.

    Original title: An App. called AppleMobileDeviceService.exe consistently takes 50% of CPU usage. I am not using iTunes. Apple says iI should ask Microsoft. I use AX oper. sys.

    An App. called AppleMobileDeviceService.exe consistently takes 50% of CPU usage. I am not logged on to iTunes, nor is my iPod connected to my PC when this .exe runs with 50% usage. Apple suggested I contact Microsoft. I use AX oper. sys. Apple suggested
    contacting Microsoft.
     
    armycyrus, Sep 24, 2020
    #2
  3. Windows 10 Upgrade (form W7) is stuck at 47% overnight

    Thank you for the list of suggestions. That did not work : it is stuck again at 47% .

    Any other takes on that problem?

    Thanks.
     
    AlexDash57, Sep 24, 2020
    #3
  4. Jeroen HD Win User

    Windows Defender using 47% of CPU consistently

    Windows Defender - high CPU and disk usage

    Thank you very much for your quick response. I've taken all steps you suggested. This is the outcome:

    • Add a process exclusion

      Unfortunately, this didn't work. I added both a path and a process exclusion now.The task scheduler for
    • Defender looks like this for me:

      Windows Defender using 47% of CPU consistently 500e27c6-8f11-48d6-9b5f-12b278352fcf.png

    • It seems no Defender tasks have run since June 30th, yet the process continues to hog the CPU
    • I re-ran SFC /scannow. SFC could not find any integrity violations
    • I tried disabling behaviour monitoring. The setting did not persist across a reboot, and turning it off did not make a difference while my system was still running.


      This was the output for Powershell:

    PS C:\Windows\system32> Set-MpPreference -DisableBehaviorMonitoring $True

    PS C:\Windows\system32> Get-MpPreference | findstr "Behavior"

    DisableBehaviorMonitoring : True

    PS C:\Windows\system32>

    • Scanning for viruses and leftover antivirus software. This was interesting (yet unfruitful):

      Neither Kaspersky nor Emisoft could find any threats. MalwareBytes did find 5 executables in my temp folder, although Virustotal.com reported no danger for the files. This could mean it's a false positive, but I removed all traces of them anyway.

      It also found two installers (PUPs) for a Spigot toolbar, I removed those as well. They probably came with some free software package, I try to prevent installing toolbars.
    • In installed AVG Anti Virus (the free version). When I rebooted after the installation, Defender was still running and taking up 25-30% of my CPU. I disabled Defender using the Group Policy editor and the service finally stopped.

    AVG works for me, but like most free anti virus programs it's full of ads and "free offers" and fishy SSL/TLS interception ("web protection").

    I'd like to keep using Windows Defender because it's neatly integrated into Windows 10, doesn't take a lot of resources and doesn't show annoying ads.

    I hope anyone can suggest another way to fix this weird Windows Defender problem.
     
    Jeroen HD, Sep 24, 2020
    #4
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Windows Defender using 47% of CPU consistently

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