Does virtualization improves gaming or dual boot performance?

Solution 1:

The purpose of Intel VT is to improve the performance of virtual machines. Intel VT CPU virtualization features enable faithful abstraction of the full prowess of an Intel CPU to a virtual machine (VM). All software in the VM can run without any performance or compatibility hit, as if it was running natively on a dedicated CPU ^Intel , however for gaming you generally need DirectX from Wine or Proton which defeats the purpose of running Windows in a VM just to play games. ^Quora unless your are running VMware Workstation which supports DirectX 11 and earlier. DirectX support in VirtualBox is currently 8/9 which is OK for older games.

Enabling Intel VT in the BIOS doesn't have any performance effects on dual booting Windows and Linux except in virtual machines.