Hello Again,
Finally I found a solution to this problem !!!
For my network worked very well to "Make available Offline"the hub.
So , first you map the drive and you choose a letter , and after that click right on the drive and activate the option “make available offline”.
With this option ON the network speed came up to 11 Mb/sec . Without the option the speed decreased to 3-4 Mb /sec .
I will check also some other options maybe I will raise the speed to a maximum 16 Mb/sec.
