I have done some further tests and I think that the problem has maybe nothing to do with the onboard buffer. Because when I use a shorter message text (10 or less message packets), the same problem exists. Even when I modify the acquisition duration, there were no improvements. I have tried it with the original receiver VI and my receiver VI with queues. Within the USRP Packet Receiver_mod_queue.vi 84 KB I also modified the maximum queue size, but that also changes nothing.