Windows 10: High CPU usage after some idle minutes

I noticed that when I stop using mouse and keyboard, after minutes my CPU usage rises from ~3% to 50%, 8 out of 16 logic processors are running at full frequency. But once I move mouse or press key, CPU usage will drop to normal within ~3 seconds.I try to find which process eats up CPU, I find winver.exe or charmap.exe, both of which are not suspicious. So I suspect that there is a virus calling these system executables to hide itself, that's what I can deduce now. But anti-virus software Huorong doesn't report anything.

:)

 

System Idle Process High cpu usage

What are the processes that cause HIGH CPU usage?

 

System Idle Process High cpu usage

No, System Idle Process is *not* causing high cpu usage. It's not causing anything at all.

System Idle Process is not really any process at all. It's just a number inserted to make the total CPU usage add up to 100%. From the little information you've provided, I can't tell what your problem is, but it's definitely not System Idle Process .

 

High CPU Usage at Idle

Hey guys, recently my W10 PC seems to be using a fair bit of CPU. I noticed this because my Battlefield 1 fps appeared to have dropped. First thing I did was roll back my nvidia drivers to the previous version, but then I noticed my cpu usage. I seem to be using 35-45% cpu usage at idle. I've never seen it go below 35% (In safe mode its around 2-3%).

Things i've tried:
- Sfc scannow at boot (it found & fixed a few things)
- chkdsk /f at boot
- Stuff from here: Windows 10 High CPU Usage Fixes
- Superantispyware scan

Hopefully someone will be able to point me in the right direction!
Thanks!