My WBL 6 TB is very very slow

I am using 6 TB MBL on both the platforms (PC & Mac). When I have to copy any file from this or on this it is taking lot of time… What need to do…

Are you connecting to the MBL wireless, wired 100megabit or Gigabit connection? What speeds are you seeing?

I’m guessing you actually have an MBL DUO, not a plain MBL, as the MBL doesn’t have a 6TB model.  Only the MBL Duo does (and some other products.)