Windows Defender CPU Idle Usage

Discussion in 'Operating Systems' started by Megalith, Mar 9, 2014.

  1. Megalith

    Megalith 24-bit/48kHz Staff Member

    Aug 20, 2006
    Is it just me or does the CPU usage of Windows Defender ramp up to an absurd level when you leave your system idle? AFAIK, when your system is idle, Windows Defender will execute a number of tasks that range from scanning to updating itself.

    I literally could not go to sleep the other night because my fans would continuously start up every time I got back into bed. Eventually, I figured out it was msmpeng.exe, and the only way to stop it was to disable real-time protection in Windows Defender. Even disabling all of the related entries in Task Scheduler wouldn't stop it.
  2. Liger88

    Liger88 2[H]4U

    Feb 14, 2012
    No it's not unusual. It glitches out quite a bit with the high CPU usage that basically never goes down. I've since disabled it and relied heavily on its true successor MSE which does a much better job than Defender ever has. It can be tricky disabling though. Been a long time since I've done it but I remember I had to go through some hoops.

    Really is an annoying glitch.
  3. bigdogchris

    bigdogchris [H]ard as it Gets

    Feb 19, 2008
    But with Windows Defender, you can run other AV products. With MSE you cannot. So there are scenarios where someone may want to run Defender + an AV.
  4. PornoSatan

    PornoSatan 2[H]4U

    Sep 3, 2004
    Yeah I noticed it too. What I also don't like about it is it ramps up disk activity as well. On the other hand though people don't like AV's running scans while they're using their system, so the only other options really are to do them while idle or on demand.