High CPU usage due to Performance Monitor (perfmon.exe) in Windows can be caused by many factors. Here are working solutions to fix the issue.

If you face a Windows Server slow performance issue, you can upgrade the hardware, such as Memory or the Processor. More ...

Once SQL Server is installed and all windows are closed, the CPU usage never drops below 20% in VMM. I was puzzled by this for some time, probably longer than I should have been.

HWiNFO is one of the best free hardware monitoring tools. The latest version of the software has fixed legacy CPU usage reading on Windows 11, a kernel-mode hardware stack driver bug, and more.