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Troubleshoot Slow or Halted Simulation on Windows

On my Windows® system, during software installation and when I try to run real-time simulation, I see this warning message:

The Hyper-V hypervisor has been detected. The Simulink Desktop Real-Time kernel 
cannot run in the presence of the hypervisor. Please disable the Hyper-V operating 
system component before attempting to use Simulink Desktop Real-Time.

Or, on releases previous to R2022a, I see slow or halted simulation on my Windows system. Simulation fails with an error message:

Warning: The "Real-Time Synchronization" block has timed out while
trying to synchronize to real-time kernel.

What This Issue Means

This message indicates that the system could not load and start the kernel due to Microsoft® virtualization.

Try This Workaround

To identify the cause of the issue, in the Command Window, type:


Examine the system information from these commands. Check whether the last line is:

Hyper-V Requirements:
   A hypervisor has been detected. Features required for Hyper-V will not be displayed. 

The Windows Hyper-V feature and other Microsoft virtualization features are not compatible with the Simulink® Desktop Real-Time™ kernel. You cannot use Microsoft virtualization with the real-time kernel. To disable Hyper-V and other Microsoft virtualization features:

  1. From the Start menu, search for Turn Windows features on or off.

  2. Select Turn Windows features on or off.

  3. Clear the boxes for features:

    • Hyper-V

    • Virtual Machine Platform

    • Windows Hypervisor Platform

    • Windows Subsystem for Linux

    Image of Windows Feature, disabling Microsoft virtualization

  4. After the uninstall process completes, restart the computer as prompted.

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