Make sure to find the correct one and remove them. Windows 11 and Windows 10 have slightly different names for these features. Microsoft services like Hyper-V always access the VT-x technology first while the host OS boots up hence, VirtualBox can’t access them later. These features and VirtualBox can’t work together well on a computer. If you installed Hyper-V, Sandbox, Docker features or anything related to Hyper-V recently, you need to uninstall them. How to Fix Extremely Slow VirtualBox VMs – Windows 11/10 Host 1) Uninstall the Hyper-V feature We discussed a similar problem earlier here. Hyper-V and VirtualBox can’t access the VT-x (Virtualization technology) simultaneously on a computer. When the Windows services occupy this feature, VirtualBox can’t use it. VT-x is a critical feature the VirtualBox uses to run the VMs at optimal speed. The Microsoft Hyper-V feature or related services using virtualization technology (VT-x) on your computer. Reason for the Slow VirtualBox VMs in Windows 11 This indicates that there is a performance issue for the VM.
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