Not sure if this has copy/move commands, but you can find out…
The reason it is slow, if using file explorer, it will depend if you stay within a share or not. If you do not, it will copy as:
MBL share → PC → MBL share.
Otherwise, the only option I can think of… Drum roll… “Command Line”. This can be done VERY easily via Putty. It is always fun to learn something new!!!