For whatever reason, no Roku player ever seems to report accurate internet speeds. With any of mine, Netflix always reports far lower than my actual speed that I can read directly on my DSL modem display. When we still had the functional Speedtest channel, it too was always crazy low. But I've enabled the geek info on YouTube and streamed some 4K material, and seen bitstream speeds approaching my actual DSL speed, so I know the Roku is doing fine. In addition, I can stream UHD movie rips from my server and monitor the network stream from my server. I've seen steady streams of over 60 Mbps, and peaks of about 115 Mbps, so maxing out the Ethernet connection on the Roku. For some reason, my 5 GHz wireless is slower than hard wired, so I don't bother with it.
Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.