Windows 10: windows defender is using high cpu and power

for the past 2 weeks i have been noticing that my cpu is always above 80-90% even if im not using any application at all in task manager first i found that windows defender real time protection was consuming the cpu then i turned it off and it kept renabling itself so i changed its task scheduler to run only when my pc is idle but that still didnt fix and i had to deactivate it as wholesince yesterday, now the problem is being caused by windows defender firewall [localservicenonetworkfirewall] then i looked it up and found that restarting windefend can help but it doesnt work. second i foun

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High CPU usage by Antimalware Service Executable > Microsoft Defender, when Windows Firewall turned off

Hello! Dude.

I'm Allen, once I have also gone through with the same issue " Antimalware Service Executable’ High CPU Issue on Windows 10" as I am also a Windows 10 user, but I get my problem by the simple steps. which I want to share with you.

Nothing you have to do just follow the simple steps which are mentioned below to resolve your problem: -

• Disable Windows Defender with the Registry Editor.
  
• Change the schedule for Windows Defender
  

If you want to know about the resolving process in detail, then kindly visit the site given: -

Fixed: ‘Antimalware Service Executable’ High CPU Issue on Windows 10

 

Shutdown restarts and high CPU

I have two issues please that I would like some advice:

Conditions for error:

When I leave my computer on idle for more than 2 hours plus, the computer

1. Goes into 197% CPU usage
2. When I shutdown, goes into restart and not shut down

What have I done to resolve this?

1. This happens on two accounts
2. Updated firmware to latest bios
3. Run diagnostics; task manager, CPUID, perfmon, all with no issues reported
4. Sent the device back to the supplier for them to run diagnostics
5. Disabled high CPU applications (the biggest being qsynch)
6. Reviewed online rports and changed restrty settings on HK Local
7. Reviwed power management as suggested
8. Run Malwarebytes, Bitdefender, and EDR Comodo
9. Run qualys vulnerability scan
10. Checked windows defender

My setup:

1. Intel NUC I7 10th generation bought from simply NUC
2. 64 gb of RAM
3. 1tb Samsung 970 NVME
4. Windows 10 pro, with all latest updates
5. High speed broadband

I would be grateful for some advice re what to do next to fix this issue.

Regards,

Mike

 

Windows Defender - high CPU and disk usage

Thank you very much for your quick response. I've taken all steps you suggested. This is the outcome:

• Add a process exclusion
  
  Unfortunately, this didn't work. I added both a path and a process exclusion now.The task scheduler for
• Defender looks like this for me:
  
  
  
  

• It seems no Defender tasks have run since June 30th, yet the process continues to hog the CPU
• I re-ran SFC /scannow. SFC could not find any integrity violations
• I tried disabling behaviour monitoring. The setting did not persist across a reboot, and turning it off did not make a difference while my system was still running.
  
  
  This was the output for Powershell:
  
  

PS C:\Windows\system32> Set-MpPreference -DisableBehaviorMonitoring $True

PS C:\Windows\system32> Get-MpPreference | findstr "Behavior"

DisableBehaviorMonitoring : True

PS C:\Windows\system32>

• Scanning for viruses and leftover antivirus software. This was interesting (yet unfruitful):
  
  Neither Kaspersky nor Emisoft could find any threats. MalwareBytes did find 5 executables in my temp folder, although Virustotal.com reported no danger for the files. This could mean it's a false positive, but I removed all traces of them anyway.
  
  It also found two installers (PUPs) for a Spigot toolbar, I removed those as well. They probably came with some free software package, I try to prevent installing toolbars.
• In installed AVG Anti Virus (the free version). When I rebooted after the installation, Defender was still running and taking up 25-30% of my CPU. I disabled Defender using the Group Policy editor and the service finally stopped.

AVG works for me, but like most free anti virus programs it's full of ads and "free offers" and fishy SSL/TLS interception ("web protection").

I'd like to keep using Windows Defender because it's neatly integrated into Windows 10, doesn't take a lot of resources and doesn't show annoying ads.

I hope anyone can suggest another way to fix this weird Windows Defender problem.