I'm still unable to get reasonable transfer times.

My system:

iMac 24" 2009
Mavericks 10.9.2
3.06 Intel Core Duo 2
6GB RAM
Tuxera NTFS 2013.2 Trial

Tried copying BIG files (.MKV) for a total of 100GB from one external drive to another, external drives being:

Toshiba 3TB USB3 DWC130 (between two of them)

and

Toshiba 3TB USB3 DWC130 and a WD 2TB WD20EARS on Sharkoon enclosure....

Same results: average speed time for the copy to happen is 2-3h for 100Gb worth of data....

Shouldnt it be a matter of 30min or so??

What am i missing here?