Hi there, If you are seeing speeds of over 1GB then I think they must be somewhat inaccurate.
All the tests I have been running have been going through a Gigabit switch, (WD My Net) or via the first node on my mesh network (Tenda WM12) - I don't beleive either of these devices are capable of over 1GB speeds. The network card I am using is a Lenovo port replicator: Powered USB-C Travel Hub.
I hope this helps