![]() 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. ![]() ![]()
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