Hello, I've made some progress in troubleshooting my issue. Turns out that the performance issue is not the dongle at all. Am yet to fully resolve (and thus understand) the issue but can advise that the issue may be a routing issue or some sort of network configuration issue. The scenario that I have is as follows: User PC's Main router (main link down) 2nd router (use backup link) 4G dongle I need two routers, because the main router doesn't have a USB port, and I want to add a backup link without discarding the existing equipment. What I have just tried is connecting a PC directly to the 2nd router and testing the 4G dongle from there. When I do that the performance is the same as when the dongle is connected to a PC. So the issue has to do with the routing between the Mikrotiks - or something like that anyway. The issue is not the 4G dongle itself. Appreciate the feedback from those who responded. Thanks Regards, Vaughan