MSE high CPU usage

Discussion in 'other anti-virus software' started by emmjay, Nov 23, 2015.

  1. emmjay

    emmjay Registered Member

    Joined:
    Jan 26, 2010
    Posts:
    884
    Location:
    Triassic
    I have noticed that when MsMpEng starts up, an svchost starts up and runs at 50% - it continues to run until MSE finishes its download and daily scan. My system spikes to 100% , especially if I am doing other work at the time. I have MBAM set to download and scan 1 hour after MSE so there is no clash there. My system has very low CPU usage on average - until MSE starts up. There is a setting in MSE 'limit CPU usage during scan' set at 50% - I thought that this meant that MSE would not start a scan if my CPU usage was 50% or above - so I have no need to change this, right?

    I have not seen this on W10, it is only happening on W7. Anyone else see this svshost at 50% CPU when running MSE ?
     
    Last edited: Nov 23, 2015
  2. xxJackxx

    xxJackxx Registered Member

    Joined:
    Oct 23, 2008
    Posts:
    4,052
    Location:
    USA
    This very situation is why I cannot understand why people think this is a light product. The only way I have ever been able to prevent this is to disable it and install something else.
     
  3. ghodgson

    ghodgson Registered Member

    Joined:
    Dec 20, 2003
    Posts:
    784
    Location:
    UK
    I don't recall the CPU usage when using MSE, but I DO recall the huge slow down of my Win 7 system when it was installed, which is why I uninstalled it and started using something else.
     
  4. Phant0m

    Phant0m Registered Member

    Joined:
    Jun 7, 2003
    Posts:
    3,684
    Location:
    Canada
    That MSE feature cut down the impact that a scan has on the system. The amount of CPU time allocated to the scan can be limited. Basically, 50% means half-throttle for scanning so it'll take longer to complete but not consume all of the systems resources that could be a necessity for multitaskers.
     
  5. xxJackxx

    xxJackxx Registered Member

    Joined:
    Oct 23, 2008
    Posts:
    4,052
    Location:
    USA
    The problem with that 50% is that with a multicore CPU it uses 100% of half of the cores. That will still choke most any machine.
     
  6. JRViejo

    JRViejo Global Moderator

    Joined:
    Jul 9, 2008
    Posts:
    20,981
    Location:
    U.S.A.
    emmjay, I had the same svchost issue until I installed this update: https://support.microsoft.com/en-us/kb/3102810. Afterwards, it doesn't go any higher than 20%, when checking/installing MSE updates. And when scanning, that svchost is at 0% CPU.
     
  7. emmjay

    emmjay Registered Member

    Joined:
    Jan 26, 2010
    Posts:
    884
    Location:
    Triassic
    I have that KB installed. I thought KB312810 was only associated with windows update - re: faster delivery of updates on Patch Tuesday. I know that MSE def updates are delivered thru WU but they are very small in size and get downloaded very quickly - I see no delay at all. I am not seeing what you are seeing in CPU usage.
     
  8. JRViejo

    JRViejo Global Moderator

    Joined:
    Jul 9, 2008
    Posts:
    20,981
    Location:
    U.S.A.
    I thought so too, yet, as soon as I installed that KB , my svchost high CPU issue went away. My Win7 is a 64-bit BTW.

    It's always fun in Microsoft land these days. ;)
     
  9. funkydude

    funkydude Registered Member

    Joined:
    Apr 5, 2004
    Posts:
    6,856
    You're comparing MSE on Win7 vs Defender on Win10 which is what most people refer to these days. Different products, yet referred to with the same name.
     
Loading...