Windows 10: [Windows 11 Home 23H2] CPU getting very hot when scanning with Defender.

I have a Ryzen 9 3900x and use a Corsair iCUE H115i RGB Pro XT AIO cooler. Even when I set the fans to constant 100% and set the pump to Extreme, whenever I perform ANY scan on Defender my CPU is pushing 90 degrees, and all cores/threads are at a constant 100% usage! I can play demanding games all day and do heavy video conversions and it NEVER gets anywhere near those temps. Why does Defender want to kill my CPU?Also, Defender rarely finishes any scans, as at a certain point it stops scanning files and the ETA doesn't change.Here is a link to my DXDiag info Pastebin is downhttps://privat

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Windows defender advanced scan extreme cpu overload

I routinely do Windows defender advanced scans. Up until about 2 weeks ago, that is.

All of a sudden the scan was completely maxing out my cpu. I wouldn't say it crashed the computer, but if I tried to do the simplest task while it was running, it rendered the machine unusable due to the draining of resources. Not to mention the scan would disappear, but was still running in the background. The only thing I could do at that point was to wait until it was done scanning, or shut down the unit

I found this thread that's about a year old, followed some of the suggestions, but nothing really helps.

I have no problem with the Quick scan.

High CPU usage when Windows Defender perform a Full Scan in Windows 10 - Microsoft Community

Windows Defender is my only virus protection, so there is nothing to create a conflict.

I put my defender installer folders in the excluded list. I changed my power settings from High Performance to Balanced.

I ran chkdsk /scan, sfc /scannow, dism /online /cleanup-image /restorehealth, and a Memory diagnostic. All normal.

Finally, I did a fresh install.

Is anybody else experiencing this?

 

defender scans

Hi Ian,

Thanks for posting your query on Microsoft Community.

This issue might occur if you have set any task scheduler for Windows Defender.

I suggest you to delete the task for Windows defender and check if it helps.

Follow the below steps:

• 
  Search and open Schedule tasks.
  
• 
  In the left-hand menu, open the Task Scheduler Library, then select
  Microsoft >Windows >Windows Defender.
  
• 
  Double-click Windows Defender Scheduled Scan.
  
• 
  Select the Triggers panel, then select Delete.
  

Hope it helps, reply to us with the status of your issue. We will be happy to assist you.

 

100% CPU usage when performing a full system scan.

Hello. I decided to do a full system scan in windows defender and my CPU usage reached 100%, and my cpu gets very hot. Is it normal? The scan also scanned 1,300,000 files, but the results say that only 792,000 files were scanned.