Windows 10: Extreme CPU usage for explorer.exe while using second display

Hello there,I run Windows 10 Pro version 21H2 OS build 19044.1889 on my Lenovo Legion 5 15IAH7.As I said, whenever I use my second screen I have extremely high CPU usage by exeplorer.exe. I dont even use the File Explorer when it happens.The problem occurs randomly but consistenly. It seems like it happens only when I use the second display to extend the screen.Usually it does not happen immediately when I connect the second display.Whenever it happend, restarting the Explorer from the Task Manager stops it for a little while, but it always comes back.It also stops immediatly by disconnecting

:)

 

Display CPU usage in systray

I'm sure there are free options out there... but AIDA64 Extreme, will monitor anything, show it anywhere, even send it to a smart phone. *Smile

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I mostly monitor temps, and I like the movable, configurable desktop OSD. But it will also display on the Taskbar, a smartphone, etc.
You can even change size, font, color... etc.









These are just some of the Sensor Icons, for the System Tray. And there's another set for the Desktop Gadget.






My Taskbar is set to the smallest possible size.

 

Problem: Explorer 50% cpu usage


Every day, at intermittent times unrelated to anything I do [it happens when I'm doing nothing], Explorer starts running with each core at about 50% cpu usage, and does not stop. Temperatures and fan speeds rise, fans become very noisy.

Speedfan indicates core temps rise to ~ 70 degrees C, "Temp1" rises to 75 - 80 degrees, fan 1 speed ~ 4000rpm,
fan 2 speed ~ 2500 rpm.

I have just installed Windows 10 so it seems it could not be caused by a virus/malware.

In windows 7 forums some users found the problem was caused by a corrupted file:

Explorer.exe 50% CPU usage - Windows 7 Help Forums

Since my problem is intermittent is it unlikely to be caused by a corrupted file?

I can't use the solution suggested in the W7 forums because when I kill explorer I lose my desktop.

I ran diskcheck on both my hard drives and it reported no errors found.

Any suggestions would be welcomed.

Can someone please explain why a corrupted file would cause explorer to run at 50% cpu usage?

 

Windows Explorer high CPU Usage in Windows 10

Hi Andrew,

Usually, too many background processes can boost your CPU usage. Since you already disabled the apps that are not necessary on startup,
we suggest checking the applications running once you have successfully boot Windows 10. To do this, simply follow the steps below:

• Click on the Start button and type Task Manager on the search box.
• On the Task Manager window, you should see the programs running.
• Click on the More details drop-down button to see the total number of apps running and their real-time CPU usage.

From there, you should see what applications are running on high CPU usage. You can also
restart the Windows Management Instrumentation service and see if your CPU performance will improve. Follow the instructions below to restart the service:

• Click on the Start button and type Services.
• Scroll down the list and look for Windows Management Instrumentation.
• Right click on it and select Restart.

Should you have further questions, please let us know.