How can I change the cpu priority for msmpeng.exe?


K

KDAM71

Member
Local time
7:08 PM
Posts
32
OS
Windows 11
Hello

I like to scan my disks regularly using defender. I'd also like to keep using windows during the scan. When defender is scanning my disks the cpu usage by msmpeng is around 80%. I tried lowering the priority but I get the message "access denied". Then I tried to take ownership of msmpeng but that was denied as well.
Does someone know a way to lower priority for msmpeng?

Kind regards, Klaas
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    MSI
    CPU
    11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz 2.69 G
    Motherboard
    I don't know. Laptop model is GF63 Thin 11 UC
    Memory
    8GB
    Graphics Card(s)
    NVidia GeForce RTX 3050 Laptop GPU, Intel UHD Graphics
    Sound Card
    I mainly use a Logitech bluetooth audio receiver
    Monitor(s) Displays
    I use the buildin laptop screen which uses Intel UHD Graphics
    Screen Resolution
    1920x1080
    Hard Drives
    WDC PC SN540 SDDPNPF-512G-1032
    Mouse
    Touchpad
    Internet Speed
    DSL
    Browser
    Firefox
    Antivirus
    Windows Defender
You can use attached batch script to change Windows Defender Antivirus Maximum CPU Usage for a Scan in Windows 10 and Windows 11.
 

Attachments

  • Change_Windows_Defender_Antivirus_Maximum_CPU_Usage.bat
    941 bytes · Views: 4

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    HP Pavilion
    CPU
    AMD Ryzen 7 5700G
    Motherboard
    Erica6
    Memory
    Micron Technology DDR4-3200 16GB
    Graphics Card(s)
    NVIDIA GeForce RTX 3060
    Sound Card
    Realtek ALC671
    Monitor(s) Displays
    Samsung SyncMaster U28E590
    Screen Resolution
    3840 x 2160
    Hard Drives
    SAMSUNG MZVLQ1T0HALB-000H1
FreeBooter said:
You can use attached batch script to change Windows Defender Antivirus Maximum CPU Usage for a Scan in Windows 10 and Windows 11.
Click to expand...
Thanks for the effort but it doesn't seem to change the cpu usage. I chose 20.
Is this supposed to be a permanent change? Should I restart windows for the change to take effect?
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    MSI
    CPU
    11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz 2.69 G
    Motherboard
    I don't know. Laptop model is GF63 Thin 11 UC
    Memory
    8GB
    Graphics Card(s)
    NVidia GeForce RTX 3050 Laptop GPU, Intel UHD Graphics
    Sound Card
    I mainly use a Logitech bluetooth audio receiver
    Monitor(s) Displays
    I use the buildin laptop screen which uses Intel UHD Graphics
    Screen Resolution
    1920x1080
    Hard Drives
    WDC PC SN540 SDDPNPF-512G-1032
    Mouse
    Touchpad
    Internet Speed
    DSL
    Browser
    Firefox
    Antivirus
    Windows Defender
Reboot to see changes take effect, don't forget the batch script use for lowering defender scan CPU usage.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    HP Pavilion
    CPU
    AMD Ryzen 7 5700G
    Motherboard
    Erica6
    Memory
    Micron Technology DDR4-3200 16GB
    Graphics Card(s)
    NVIDIA GeForce RTX 3060
    Sound Card
    Realtek ALC671
    Monitor(s) Displays
    Samsung SyncMaster U28E590
    Screen Resolution
    3840 x 2160
    Hard Drives
    SAMSUNG MZVLQ1T0HALB-000H1

My Computer

System One

  • OS
    Windows 11 Home
    Computer type
    PC/Desktop
    CPU
    AMD Ryzen 5 3600 & No fTPM (07/19)
    Motherboard
    MSI B450 TOMAHAWK 7C02v1E & IFX TPM (07/19)
    Memory
    4x 8GB ADATA XPG GAMMIX D10 DDR4 3200MHz CL16
    Graphics Card(s)
    MSI Radeon RX 580 ARMOR 8G OC @48FPS (08/19)
    Sound Card
    Creative Sound Blaster Z (11/16)
    Monitor(s) Displays
    24" AOC G2460VQ6 (01/19)
    Screen Resolution
    1920×1080@75Hz & FreeSync (DisplayPort)
    Hard Drives
    ADATA XPG GAMMIX S11 Pro SSD 512GB (07/19)
    PSU
    Seasonic M12II-520 80 Plus Bronze (11/16)
    Case
    Lian Li PC-7NB & 3x Noctua NF-S12A FLX@700rpm (11/16)
    Cooling
    CPU Cooler Noctua NH-U12S@700rpm (07/19)
    Keyboard
    HP Wired Desktop 320K + Rabalux 76017 Parker (01/24)
    Mouse
    Logitech M330 Silent Plus (04/23)
    Internet Speed
    400/40 Mbps via RouterOS (05/21) & TCP Optimizer
    Browser
    Edge (No FB/Google) & Brave for YouTube & LibreWolf for FB
    Antivirus
    NoAV & Binisoft WFC & NextDNS
    Other Info
    Headphones: Sennheiser RS170 (09/10)
    Phone: Samsung Galaxy Xcover 7 (02/24)
FreeBooter said:
Reboot to see changes take effect, don't forget the batch script use for lowering defender scan CPU usage.
Click to expand...
I ran the script, chose 20, rebooted and started the scan. The cpu usage is around 90% for a while now.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    MSI
    CPU
    11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz 2.69 G
    Motherboard
    I don't know. Laptop model is GF63 Thin 11 UC
    Memory
    8GB
    Graphics Card(s)
    NVidia GeForce RTX 3050 Laptop GPU, Intel UHD Graphics
    Sound Card
    I mainly use a Logitech bluetooth audio receiver
    Monitor(s) Displays
    I use the buildin laptop screen which uses Intel UHD Graphics
    Screen Resolution
    1920x1080
    Hard Drives
    WDC PC SN540 SDDPNPF-512G-1032
    Mouse
    Touchpad
    Internet Speed
    DSL
    Browser
    Firefox
    Antivirus
    Windows Defender
www.majorgeeks.com

How to Change Windows Defender Max CPU Usage - MajorGeeks

Windows Defender has come a long way, now becoming the default antivirus program for most geeks. That doesn't mean you can't make some tweaks, however. One tweak we love to apply is limiting the maximum amount of CPU used during scans.
www.majorgeeks.com
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    HP Pavilion
    CPU
    AMD Ryzen 7 5700G
    Motherboard
    Erica6
    Memory
    Micron Technology DDR4-3200 16GB
    Graphics Card(s)
    NVIDIA GeForce RTX 3060
    Sound Card
    Realtek ALC671
    Monitor(s) Displays
    Samsung SyncMaster U28E590
    Screen Resolution
    3840 x 2160
    Hard Drives
    SAMSUNG MZVLQ1T0HALB-000H1
FreeBooter said:
www.majorgeeks.com

How to Change Windows Defender Max CPU Usage - MajorGeeks

Windows Defender has come a long way, now becoming the default antivirus program for most geeks. That doesn't mean you can't make some tweaks, however. One tweak we love to apply is limiting the maximum amount of CPU used during scans.
www.majorgeeks.com
Click to expand...
Thanks. Your script has set the value properly. It doesn't seem to have the desired effect on my computer though.
Now I set the value to 5. I rebooted and started the scan. The cpu usage stays under 10% for about a minute. Than it jumps to around 90% and stays there for about 7 minutes. Than it gradually comes down to under 10% again and stays there for the remainder of the scan (about 11 minutes).
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    Laptop
    Manufacturer/Model
    MSI
    CPU
    11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz 2.69 G
    Motherboard
    I don't know. Laptop model is GF63 Thin 11 UC
    Memory
    8GB
    Graphics Card(s)
    NVidia GeForce RTX 3050 Laptop GPU, Intel UHD Graphics
    Sound Card
    I mainly use a Logitech bluetooth audio receiver
    Monitor(s) Displays
    I use the buildin laptop screen which uses Intel UHD Graphics
    Screen Resolution
    1920x1080
    Hard Drives
    WDC PC SN540 SDDPNPF-512G-1032
    Mouse
    Touchpad
    Internet Speed
    DSL
    Browser
    Firefox
    Antivirus
    Windows Defender
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