Slooooooow transfer speeds from folder to folder on same Mybook?

I have a MB Live and am moving files from one folder to another on the SAME drive (mybook). They are taking a very long time. these are all .mkv files about 1-2gb, but they are local so they shouldnt be taking that long right?

My MB Live is connected to a gigabit router via ethernet cable and im using a windows machine connected to my network via ethernet through a wireless bridge. 

any help would be much appreciated

If you’re moving from one folder to another within the SAME share, it should be very quick.

If you’re moving from one folder to another in a DIFFERENT share, it will take much longer because the data has to transit your PC via the network.