Hi Jammy,
I can also confirm what Antonio replied.
When I was building firmware for MESHdesk using the then trunk (Barrier Breaker) I nearly gave up on the Dragino hardware (AR9331) because the adhoc connections between nodes refused to connect beyond 1Mbps unless you restart the WiFi a one or more times.
Other Atheros based hardware like the OM2P's did not have the same issue though.
On advise from Steve Song (Village Telco) I tried Attitude Adjustment and all that problems disappeared and there is now proper speed between the adhoc connections.
I haven't tried again on Barrier Breaker, but will probably in the near future do another attempt and see if the problem still exists now that it has been released.
Cheers