Windows Defender scan anomoly


tinmar49

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I quite often set WD to run a full scan when I am using the pc and it says something like "feel free to continue using the pc while the scan is running".
Lately I have noticed that if I minimise the running scan and get on with other things, mainly online and then check how the scan is progressing, it has stopped or slowed right down. It can't be that my pc is too slow, I am using the Ryzen 5700G with 32Gb ram and a fast HDD, total overkill for mainly surfing the web, I know.
 
Windows Build/Version
W11pro beta

My Computers

System One System Two

  • OS
    W11 pro beta
    Computer type
    PC/Desktop
    Manufacturer/Model
    home built
    CPU
    Athlon 3000G
    Motherboard
    Asrock A320M-HDV r4.0
    Memory
    16Gb Crucial DDR4 2400
    Graphics Card(s)
    onboard cpu
    Sound Card
    onboard
    Monitor(s) Displays
    LG 22EA53
    Screen Resolution
    1920 x 1080
    Hard Drives
    WD black SN750 M2 500Gb
    PSU
    500W Seasonic core 80+gold non modular
    Case
    Fractal Design Define R2
    Cooling
    front 2 x 120mm rear 100mm stock psu
    Internet Speed
    135/20
    Browser
    Firefox and edge
    Antivirus
    Windows Security and free Malwarebytes
  • Operating System
    W11 pro 64 beta (from W10 pro system builder pack)
    Computer type
    PC/Desktop
    Manufacturer/Model
    homebuilt
    CPU
    Ryzen 7 5700G
    Motherboard
    MSI B450 tomahawk max II
    Memory
    4 x 8Gb Corsair Vengeance LPX 3000 DDR4
    Graphics card(s)
    onboard cpu
    Sound Card
    motherboard
    Monitor(s) Displays
    AOC 27
    Screen Resolution
    2560 x 1440
    Hard Drives
    WD 1Tb Black M2 SN850X on Asus hyper M2 X16 max V2 card
    PSU
    Be Quiet 400 semi modular 80+gold
    Case
    Coolermaster Silencio 650
    Cooling
    140mm front, 120 rear Akasa Vegas Chroma AM
    Internet Speed
    135/20
    Browser
    edge/Firefox
    Antivirus
    WD plus Malwarebytes free
a fast HDD,
No such thing anymore.
Windows 11 does not make it a requirement but as your main OS storage device, a SATA SSD or NVME is highly recommended.
Keep in mind that a file scan by defender has to go over 330000 + files.
 

My Computers

System One System Two

  • OS
    All Branches but Release
    Computer type
    Laptop
    Manufacturer/Model
    Acer Nitro ANV15-51
    CPU
    AMD Ryzen 7 7735HS 3200-4500 Mhz 8 cores x 2
    Motherboard
    Sportage_RBH
    Memory
    32 GB DDR5
    Graphics Card(s)
    Radeon Graphic / NVIDIA GeForce RTX 4060 8 GB GDDR6
    Sound Card
    AMD/Realtek(R) Audio
    Monitor(s) Displays
    Integrated Monitor (15.3"vis)
    Screen Resolution
    FHD 1920X1080 16:9 144Hz
    Hard Drives
    KINGSTON OM8SEP4512Q-AA 1TB
    Western Digital 256GB
    PSU
    19V DC 6.32 A 120 W
    Cooling
    Dual Fans
    Mouse
    MS Bluetooth
    Internet Speed
    Fiber 1GB Cox -us & 1GB Orange-fr
    Browser
    Edge Canary- Firefox Nightly-Chrome Dev-Chrome Dev
    Antivirus
    Windows Defender
  • Operating System
    Windows 11 Beta
    Computer type
    Laptop
    Manufacturer/Model
    Asus X751BP
    CPU
    AMD A9-9420
    Memory
    8 GB of DDR4
    Graphics card(s)
    AMD Radeon R5
    Screen Resolution
    1600x900
    Hard Drives
    Seagate 1 TB
and then check how the scan is progressing, it has stopped or slowed right down.
I think the UI freezes without affecting the scan engine. Watch the Event Viewer’s Event ID 1001 (scan finished, including info about scan time) instead, and see if the scan time has really changed.
 

My Computer

System One

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
Nothing unusual, that is how it works. You can look at how it works with Microsoft.
 

My Computer

System One

  • OS
    Windows 11

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