One service is taking a LOT of CPU usage, and it doesn't cool down.
This started when I enabled some Windows features (Application Guard, Guarded Host, etc), and turned on BitLocker on my main C: drive.
"Microsoft Compatibility Telemetry" eats your system, which I saw in the image which you shared.
That process is built-in software of Windows 10 like cmd.exe or svchost.exe.
So, what is "Telemetry"?
"Telemetry" is a kind of software which collects data about user's computer usage.
So even if you remove it, it will come back.
I heard that there are softwares which claim disabling annoying Windows 10 features like that.
You can try it; but Own your risk!; because I did not try it.
Or you can downgrade your OS to 7 or 8.1.