Control/Diminish Windows Defender high cpu usage?


  1. Posts : 995
    Microsoft Windows 10 Professional (x64) Build 19045.2846
       #1

    Control/Diminish Windows Defender high cpu usage?


    Is there any way to do this, especially with a full scan?
      My Computer


  2. Posts : 70,036
    64-bit Windows 11 Pro for Workstations
       #2

    Hello,

    You can use an option in the tutorial below to specify the maximum percentage CPU usage allowed for a scan by Microsoft Defender Antivirus

    Set Windows Defender Antivirus Max CPU Usage for a Scan in Windows 10
      My Computers


  3. Posts : 995
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #3

    Brink said:
    Hello,

    You can use an option in the tutorial below to specify the maximum percentage CPU usage allowed for a scan by Microsoft Defender Antivirus

    Set Windows Defender Antivirus Max CPU Usage for a Scan in Windows 10
    Hi Brink,

    Am I misunderstanding, or does this only apply to quick scans, not full.

    I find other sources mentioning "How To Fix Antimalware Service Executable High Memory / CPU Usage", but is that just a method to essentially disable WD scans altogether?

    BTW, under most circumstances, can the user be comfortable that a quick scan will identify all possible threats?
      My Computer


  4. Posts : 70,036
    64-bit Windows 11 Pro for Workstations
       #4

    It's applied during any scan by Defender in Windows 10.

    Quick scans are fine, but you should run a full scan every once in a while to be sure.
      My Computers


  5. Posts : 995
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #5

    Can I assume that the scans will be considerably longer? i.e., full scans are typically around one hour. If I place a 50% limit, it'll take twice as long, or is it not that simple?
      My Computer


  6. Posts : 70,036
    64-bit Windows 11 Pro for Workstations
       #6

    50% is the current default, but yeah if you reduce the percentage, the longer the scan could take to finish.
      My Computers


  7. Posts : 198
    Windows 10
       #7

    You should have more CPU usage dedicated to a scan not less, that way it finishes faster. Don't schedule a scan as they are not really needed on a daily or even weekly basis, just do one occasionally when you can step away from the computer for a few minutes.
      My Computer


  8. Posts : 995
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #8

    Digmor Crusher said:
    You should have more CPU usage dedicated to a scan not less, that way it finishes faster. Don't schedule a scan as they are not really needed on a daily or even weekly basis, just do one occasionally when you can step away from the computer for a few minutes.
    I understand. I don't schedule scans. The problem is that while my machine is normally very responsive, those CPU draining scans affect my usage, buffering, etc.

    I'll just have to make a compromise by setting a reasonable alternative percentage, probably between 50-75%, and then use my Core Temp app (which measures CPU usage as well), to monitor the usage fluctuation. I think it will be ok if it hovers around 75% or so, so long as it isn't skyrocketing to 100%. Will see how the device operates in that environment. I'm curious to see the scan time difference, but if it cures the way my computer reacts, then it will become a non-issue. Trial and error.

    - - - Updated - - -

    Thru trial and error, it looks like setting it to 40% allows me to browse, etc., while running a full scan with little interference, not to mention it takes about the same amount of time as the when the limit was not reduced.

    Setting it to 50% or over gave consistent load readings of 90-100%, which noticeably affected my work flow. I had to keep in mind that multitasking while running the full scan will contribute to the high usage.
      My Computer


 

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