Windows 10: Windows Defender Real Time Protection slowing computer

Discus and support Windows Defender Real Time Protection slowing computer in AntiVirus, Firewalls and System Security to solve the problem; I have had my PC since February and in the past couple of days i have been experiencing delays (up to 10 seconds) when browsing the web or opening... Discussion in 'AntiVirus, Firewalls and System Security' started by DragonH, Jul 24, 2018.

  1. DragonH Win User

    Windows Defender Real Time Protection slowing computer


    I have had my PC since February and in the past couple of days i have been experiencing delays (up to 10 seconds) when browsing the web or opening programs.


    After so investigating, I have come to the conclusion that it's Windows Defender.


    When I am doing absolutely nothing on my PC and the only thing open is Task Manager, all is fine and the CPU usage is at 0-1%, but whenever I open anything, be it a game, Firefox, Office, etc.... Windows Defender starts using 30%+ of my CPU.


    Disabling Real Time Protection stops this happening and everything runs smoothly, so that's clearly the cause. However, I would prefer not to have it turned of for several reasons:

    -I want anti-virus protection

    -3rd party AV is usually more demanding (and costs money)

    -It was fine until the past few days.


    I have tried running scans, I have updated windows to the latest updates, but nothing stops the problem other than turning it off.


    Is there a way to reinstall just windows defender? Maybe that would work. I don't want to refresh Windows 10 because I have a lot of programs I don't want to have to reinstall.

    :)
     
    DragonH, Jul 24, 2018
    #1

  2. Windows Defender Real Time Protection Service slowing down file access

    I noticed after a recent Windows 10 update that Windows Defender's real-time protection
    dramatically slows file system access.

    I timed how long it took to build a (Delphi XE6) project with Windows Defender's real-time protection off and on in order to get a sense of how bad it is.


    Windows Defender Real Time Protection slowing computer 4faf6467-088e-4569-87d4-259624a4dc91.png


    I did nothing but alternate between real-time protection off and on (no reboots required, physical hardware):

    Trial
    Real-time protection status
    Build time (s)

    1
    On
    86.4 s

    2
    Off
    4.0 s

    3
    On
    84.0 s

    4
    Off
    4.0 s

    5
    On
    86.9 s

    6
    Off
    4.1 s

    7
    On
    87.4 s

    8
    Off
    3.9 s

    Which means:

    • Build time with real-time protection off: 4.0 s (sd: 0.082 s)
    • Build time with real-time protection on: 86.2 s (sd: 1.51 s)


    Windows Defender Real Time Protection slowing computer 463c8028-6809-4b99-b8c5-79c4aa4126b5.png


    This means that Windows Defender in Windows 10 has now entered the realm of other crappy anti-virus products - that are a detriment to the user's PC rather than a benefit.

    • Of course i'm not going to wipe my PC and reinstall everything.
    • Of course there is no other anti-virus software installed.
    • Of course i made no changes to this PC prior to this happening.
    • Of course this is not a virtual machine.
    • It spontaneously started Wednesday October 19.
    • I have no idea what could have happened to my PC between 5pm on October 18th, and 9am on October 19th:

    Windows Defender Real Time Protection slowing computer e9b5b2d7-93db-4792-ad78-025aa381d5b3.png


    No idea whatsoever.

    Without disabling Windows Defender Real-time protection, how do I make Windows Defender not perform file-scans before an application attempts to open a file? That is: how do i make Microsoft's own anti-virus software as fast at it used to be in Windows Vista,
    Windows 7, Windows 8, Windows 8.1, and Windows 10 before a recent update?

    Bonus Reading

    This question has of course already been asked, and ignored, on these forums.


    ***Post moved by the moderator to the appropriate forum category.***
     
    JackTripper, Jul 24, 2018
    #2
  3. adonis08 Win User
    Windows Defender Real Time Protection

    I did all the step and delete the MsMpEng.exe but still it doesn't turn on Real Time Protection any suggestion please??
     
    adonis08, Jul 24, 2018
    #3
  4. adonis08 Win User

    Windows Defender Real Time Protection slowing computer

    Windows Defender Real Time Protection

    I did all the step and delete the MsMpEng.exe but still it doesn't turn on Real Time Protection any suggestion please??
     
    adonis08, Jul 24, 2018
    #4
Thema:

Windows Defender Real Time Protection slowing computer

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