Compared to traditional BIOS (legacy) boot, UEFI has one less BIOS self-test process, so booting will be faster and save boot time.

⋆ The UEFI boot process initializes the UEFI at boot time, and then, boots the operating system directly into the system. Don’t worry, you can have a clear understanding of them here. You may familiar with the traditional legacy boot mode, but not so much with UEFI. The difference between BIOS and UEFI boot mode UEFI (Unified Extensible Firmware Interface) booting mode is a new motherboard booting project after BIOS (Basic Input Output System), breaking many of the limitations of BIOS mode, including limitations on hard drive size, boot process, number of partitions and security, and with more advanced features.

How do I create Windows 11 UEFI bootable USB? (3 ways).

Then perhaps I could go on to convert that 64-bit Legacy Windows 10 VM into a 64-bit UEFI Windows 10 virtual machine, and then proceed to a Windows 11 upgrade. If the above belief should be confirmed by others, perhaps I should update my 32-bit Legacy Windows 10 installation to a 64-bit Legacy Windows 10 installation, although that probably means losing all my Windows applications (and perhaps my data) and needing to reinstall everything. For the time being, I've come to believe that a 32-bit architecture is incompatible (?) with UEFI, although perhaps I am wrong. Perhaps I botched a foolproof procedure that should have worked. Unfortunately, all four attempts yesterday failed, as Parallels was unable to boot Windows, so I resorted to my latest snapshot to regain functionality. To ease the transition, I thought it would be a good idea to convert the Legacy (BIOS) 32-bit Windows VM installation into its UEFI counterpart via mbr2gpt, adding a virtual TPM 'chip' to the virtual hardware and allowing EFI and EFISecureBoot in the Windows VM config.pvs. If not, I hope some of the experts can provide a few pointers as to the best way to achieve the upgrade, if at all possible. If so, perhaps someone can kindly provide a link to the relevant discussion.

Uefi windows 11