CPU Usage in Task Manager Fluctuates Reaching 100% While System is Idle on Windows* 10
Content Type: Maintenance & Performance | Article ID: 000093540 | Last Reviewed: 04/26/2023
Support Knowledge Base
Environment
Operating System
Windows® 10 family
Description
Windows Task Manager shows incorrect CPU speed when Hyper-V is enabled on Windows 10*
Resolution
This is a known issue in Windows* 10 and Window* Server 2012 R2 when hyper-v is enabled in the system. 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. For more information, refer to Windows Task Manager shows incorrect CPU speed when Hyper-V is enabled.
Step 1: Check if Hyper-V is enabled in Windows 10. Follow steps below:
- Using the search window on your system, type "Turn Windows Features on or off."
- View Hyper-V options, and if checked that means Hyper-V is enabled.
Step 2: Use the built-in Performance Monitor tool to add the "\Hyper-V Hypervisor Logical Processor\Frequency" performance counter.
- Using the search window on your system, type "Performance Monitor."
- Select Performance Monitor tool.
- Select Monitoring tools drop down and select Performance Monitor.
- Click on Add button and this will the open the Add Counters window.
- In the Add Counter window, you will see the available counters, scroll down until you find Hyper-V Hypervisor Logical Processor.
- Click the arrow to open the drop down menu and look for Frequency then click to highlight it. Choose <All instances> under Instances of selected objects:
- When it's highlighted, click the Add >> button and you should be able to see it in the Added Counters.
- Click ok to apply.
- When applied you should be able to see the following at the bottom of the Performance Monitor:
