@dbuero
Outstanding throughput for Windows, congratulations! You did not mention in this thread that you were running Windows, so we assumed that you ran a different system, sorry, we could have made you save a lot of time.
Finally Windows should have a driver for a virtual network interface that allows throughput more in line to what you can get with other systems. Eddie 2.18 beta 8 has been planned to support Wintun. We are also following OpenVPN Linux kernel module (currently closed source, but they could decide to release it under some open source license during 2020). Although our servers can already reach line capacity, higher than 1 Gbit/s throughput is achieved only via multiple OpenVPN daemons, one per core.
Spread the word about the performance you can get now with AirVPN and Windows!
Kind regards