If the cosmetic changes weren’t enough to make you reconsider upgrading, the TPM requirement and reduced performance might do the trick. Windows 11 comes with VBS—that’s Virtualization Based Security, not Visual Basic Script. It isn’t new, having first been introduced to Windows 10 back in October 2019 with the 1903 9D update, but the chances are you never actually used VBS with Windows 10. In short, VBS creates a secure area in memory for other security features to use. These include TPM (Trusted Platform Modules) and HVCI (Hypervisor Protected Code Integrity).