External Drive - File movement takes forever!

I'm arranging files on an external drive to free up space to set up an automatic back-up. When I move files from one folder to another one--all on the external drive itself--it takes a long time (as though I were moving it from my iMac to the drive, rather than near instant). What causes this?





If it matters, the drive is formatted Mac OS Extended (Journaled).

via ehMac.ca http://ift.tt/1pgmJBg