Hi Vincent
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
You mentioned you just performed a clean install of Windows 10. We have been noticing this trend with high CPU after a fresh install. Normally, Windows Defender is the culprit, in addition, Windows 10 Update applying updates and like Defender definitions. Sometimes its hard pinpoint what is the exact source of the high CPU usage.
Sometimes, just giving it a few days to a week, it will eventually settle down - this has worked in most cases. So, please consider that first.
I would first check Windows Update and make sure any pending cumulative updates are actually being installed succesfully.
Go to Start -> Settings -> Update & security, then Check for updates and install any available updates.
Other things you can also check include:
If you have Chrome installed, uninstall then reinstall it.
Look for blank icons on the desktop and delete them.
Open File Explorer
Open This PC
Right click your local drive where Windows 10 is install (you will see the Windows logo on it)
Click Properties
Click the Hardware tab
What is the name of the drive listed?
Is it an SSD?
If it is, you might need to update the firmware.
Open Start > Settings > Privacy > Background apps
Disable all Background apps.
Disabling Windows Update:
Press Windows key + R
Type: services.msc
Hit Enter
Scroll down to Windows Update
Select it then right click it
Click Properties
Under the General tab, choose Startup type to Disabled
Click Stop
Click Apply then OK
Also, check whats starting up with Windows.
Press Windows key + X
Click Task Manager
Click Startup tab
Disable all except Windows Defender.
Press Windows key + R
Type: msconfig
Hit Enter
Go to the services tab
Check the box,
hide all Microsoft services
Disable the remaining services
Click Apply then OK
Restart if prompted
Open Start, type: problem reports
Hit Enter
Delete any failed or pending reports.
Go to Start > Settings > System > Notifications and actions > Turn off "Show me tips about Windows."
Open Start, type: CMD
Right click CMD
Click Run as administrator
Type: powercfg -restoredefaultschemes
Hit Enter
Exit
Create an entirely new account and delete the current one.
https://www.groovypost.com/howto/create-manage-...
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Disable Telemetry
Click Start > Settings > Privacy > Feedback and diagnostics.
Set it to basic
Click Start
Type: regedit
Right click regedit
Click Run as administrator
Navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DataCollection.
Right click and create a DWORD value named AllowTelemetry then set
Press Windows key + R
Type gpedit.msc then hit Enter
Expand Computer Configuration > Administrative Templates > Windows Components
In the Windows Components dialog, find and right-click on Data Collection and Preview Builds
Then double-click Allow Telemetry in the right pane
Choose Disabled and choose 3-Full from the drop-down menu.
Then click OK to save settings
Click Apply and ok > reboot computer
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