Windows Task Manager shows incorrect CPU speed when Hyper-V is enabled
This article provides a workaround for an issue where Windows Task Manager shows incorrect CPU speed when Hyper-V is enabled.
Applies to: Windows 10 - all editions, Window Server 2012 R2
Original KB number: 3003081
If the Hyper-V role is enabled in any of the products that are listed at the beginning of this article, the CPU Frequency speed value that is displayed in Task Manager is not the current speed, as expected. When the Hyper-V Role is not enabled, Task Manager correctly displays the current speed for this value.
To work around this issue, use the built-in Performance Monitor tool (perfmon.exe), and add the "\Hyper-V Hypervisor Logical Processor\Frequency" performance counter.
This is a known issue in the product versions that are listed at the beginning of this article.