Hi I have a Sony XR65X94J TV and the ethernet is capped at 100mbps so I got a USB gigabyte adapter and has worked but remember you WiFi must be turned off to work. It did for me. Now I'm getting over 300mbps.
EG: Video from YouTube for example...
https://youtu.be/PIef8iRZhLE
My setup in pics
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Hope this Helps you all..