#VT-x

2 guides

Diagram-style cover showing a VirtualBox VM competing with Windows 11 Hyper-V features for CPU virtualization extensions

Virtualization (Hyper-V, VMware, VirtualBox)

How to Fix VirtualBox VM Running Very Slow on Windows 11

VirtualBox crawling on Windows 11? Hyper-V, Memory Integrity, and WSL2 steal VT-x. Learn what to disable, how to allocate resources, and enable nested paging.

Sysadmin Desk Jul 20, 2026 8 min read

Diagram-style cover showing CPU virtualization extensions being claimed by the Windows hypervisor while VirtualBox waits for VT-x to be freed

Virtualization (Hyper-V, VMware, VirtualBox)

How to Fix VirtualBox VT-x Is Not Available (Conflict with Hyper-V)

VirtualBox says VT-x is not available (VERR_VMX_NO_VMX)? Here's how to free your CPU virtualization from Hyper-V, Memory Integrity, and WSL2 — and fix it for good.

Sysadmin Desk May 24, 2026 11 min read