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#900
As an experiment, I tried turning off Defender during an upgrade, and it made no difference as far as I could tell to upgrade time.
One tip for those running uuptoiso on a virtual machine. It is well known copying upgrade files to host and doing it on host can be much quicker for less powerful devices. However, if using Hyper-V, the files are already on the host really inside the virtual hard drive. Just mount vhd from disk management and files are on host - no need to copy anything.
I do the same when I want to create a Macrium Image Backup (for redeployment purposes) as it means I can use my Macrium Seven Home licence.