I have tested wow classic on a Ramdisk. It does load very fast but I wouldn’t tell people to bother if they have an nvme ssd. If you have a sata ssd or mechanical HD and have extra ram to spare then go ahead and load it onto a ramdisk.
You will not gain fps using a ramdisk.
Msi my motherboard manufacturer provides a ramdisk tool and it is set to back up the Ramdisk to a drive before shutdown. So I don’t have to move the game folder or redownload it every time I restart my pc.