If he has access to a machine with 64 GB of ram, he could probably run the entire VM install off a ramdisk.
Probably possible to do with less. Have two disk images. The standard one on SSD with the windows 10 install, and another disk image on a ramdisk on the host OS. The disk image on the ramdisk would be used for the pagefile. It would still be slower due to all of the swapping, but there wouldn't be additional penalty of a slower swap media.
The whole point was a novelty, no one expects Windows 10 to be useful running with only 192MB of RAM. However, Windows 10 running on an old single core Atom based netbook with 2GB of Ram? It runs surprisingly well. Granted, my netbook has an SSD, but still.
Whats the resolution? I had 7 on an Acer D250 and it was ok, but when 8 came out Microsoft artificially limited it to not run at whatever resolution my netbook was at (1024x600?), so that killed the netbook scene. There was no other hardware limitation that would have made 8 or 10 worse than 7. Was just a decision that killed off netbooks.