Understanding Windows 10 QCOW2: The Complete Guide to Virtualization Performance
Use scripts like Windows 10 Debloater to remove background processes that eat up CPU cycles in virtual environments.
Creating a Windows 10 QCOW2 template allows you to clone new desktops for testing in seconds.
You can save the "state" of your Windows 10 VM before making risky registry changes or installing updates. If something breaks, you can revert in seconds.