Average flow very low in Backup Exec 2014

Hello everyone,

I have backup exec 2014 (it was 2015 before) installed on physical server and configured with ROBOTIC DELL TL 2000 (Direct attached).

If i make a backup to disk, it's ok with an average flow equal 3500 MB/mn

and if i make a backup with tape library for my physical server, i have the same average flow.

Now if i make a backup for any other server, that's the problem because the flow fall to 800 MB/mn

Really i don't found any solution in internet and i have this problem for three weeks.

Can you help me please.

Best regards

Guiga