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Degraded virtual machine performance due to disabled virtualization support

  • Parallels Desktop for Mac


One of the following errors occurs when you start a virtual machine:

Your virtual machine may run slowly because virtualization support is disabled on your Mac.

Virtual machine performance may be degraded because hardware virtualization support is disabled on the host computer.


Intel VT-x technology is enabled on Intel-based Macs. However, some third-party applications that use it (such as Parallels Desktop) detect that the VT-x technology is not working properly.


  1. Make sure your Intel-based Mac has all available EFI updates installed.

  2. Confirm that you are running the latest version of Parallels Desktop.

  3. Open Applications > Utilities > Disk Utility and Repair Disk Permissions.


  4. Reinstall Parallels Desktop and check to see if the issue still persists.

If the instructions above don’t help, click the following link for more information::

Intel-based Macs: Using VT-x virtualization technology

Learn more about EFI and SMC firmware updates for Intel-based Macs from this source: :

EFI and SMC firmware updates for Intel-based Macs

If neither of these additional sources helps solve the problem, see KB 111693

Search words:

virtualization support is disabled


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