ram is faster than disk, this is less and less true with ssd, but in many situations it is still true, and can be useful to use the ram to serve files at high speed access.
Example script that first unmount a directory, then copy the content of another and mount it in ram:
# unmount umount /var/www/servemequick # mount # copy source to temporary backup cp -Rv /var/www/servemequick ./servemequick # mount new ram directory with same path as source mount -t tmpfs -o size=1g tmpfs /var/www/servemequick/ # copy backup to mounted new ram directory cp -Rv ./servemequick/* /var/www/servemequick