Windows 10: Windows 10 Defender Full Virus Scan- CPU Usage 100%

About a few months ago, i noticed this. Whenever i do a full scan of my computer, the cpu would hit 100% and stay 100%. Sometimes it might drop to 95% or 90% but then it immediately goes back to 100%. The issue here is when this happens, my laptop is basically unusable. Thus many chrome windows are frozen or lag so bad that im concerned about it. Previously when i did virus full scans, i could do other things with no issue. Does anyone know why i have this issue?


I am concerned because the CPU is 100% usage and it sounds like the computer is using lot of processing power where im concerned if my computer could turn off or something like that when using it.


Does anyone know how to fix this issue? I don't know how this happened because a while back, there was no issue like this.

:)

 

Windows 10 Defender Full Virus Scan- CPU Usage 100%

High CPU usage has been encountered before: this thread (older) refers to dealing with a corrupt database file, but it's a bit long.
High CPU usage from Windows Defender

There are other such threads if you search for (e.g.)
Defender high cpu usage





In the past, sometimes it's proved necessary to exclude a folder:
High CPU usage from Windows Defender
(same thread)

 

Windows 10 Defender Full Virus Scan- CPU Usage 100%

About a few months ago, i noticed this. Whenever i do a full scan of my computer, the cpu would hit 100% and stay 100%. Sometimes it might drop to 95% or 90% but then it immediately goes back to 100%. The issue here is when this happens, my laptop is basically unusable. Thus many chrome windows are frozen or lag so bad that im concerned about it. Previously when i did virus full scans, i could do other things with no issue. Does anyone know why i have this issue?


I am concerned because the CPU is 100% usage and it sounds like the computer is using lot of processing power where im concerned if my computer could turn off or something like that when using it.


Does anyone know how to fix this issue? I don't know how this happened because a while back, there was no issue like this.

 

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?