[Symbiote]

With the Ubuntu packaged version 2.0.0:

  Testing download speed...
  Download: 917.52 Mbit/s
  Testing upload speed...
  Upload: 4.16 Mbit/s

Yeah, there's something wrong with that. There doesn't seem to be high CPU use.

Version 0.3.4, which is the default from Apt on a test server, seems to be OK:

  Download: 2239.51 Mbit/s
  Upload: 882.54 Mbit/s

(Maximum would be 20Gbit/s both ways, but I suspect achieving that to a single server would require some network parameter tweaking.)