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Make sure to untick Hyper-V services, Virtual Machine Platform, Hypervisor Platform and Windows Sandbox.

Click on the ‘Turn Windows features on or off’ option to remove the Hyper-V and related features. Visit Control Panel -> Programs and Features.

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. You will notice a green turtle icon on the virtual machine console.Sometimes you will not get the desktop screen even after 10 minutes. Obviously, the VM boot will be too slow.How to Identify that the VM is struggling to work on Windows 11 Host? Follow the below steps to fix it and make it work like usual. Even if you haven’t installed the Hyper-V feature or already removed it (installed earlier) from the control panel, you may experience extremely slow virtual machines in VirtualBox. The main reason is the Hyper-V feature on the Windows OS. 3) Disable the Core isolation option in Windows Defender.