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The Cable Matters adapter arrived. Plugged it in and it works as described in this thread -. LG Network reports neither Ethernet or WiFI connected but everything works. The LG built-in speed test gives 220 Mbps download and 60 Mbps upload. Speedtest.net in the LG browser gives 60 Mbps download and 210Mbps upload. Netflix reports a network speed of 320 Mbps. Speedtest.net app on my iMac computer gives 601 Mbps download and 546Mbps upload. Thanks for the pointers. It seems I have two valid options - Cable Matters adapter and dedicated WiFi. I'll stick with Cable Matters adapter for now and see if I find anything that causes problems with it, knowing I have WiFi as a fallback. This has been a very useful thread - for me at least. I wonder why LG don't make their lack of interest in Ethernet clearer. Their new TVs seem to have adequate WiFi support, but Ethernet is barely acceptable on a machine of this price.

A quick follow up: While waiting for the Cable Matters adapter to arrive and inspired by posts to this thread, I played around with WiFi. Specifically I moved a redundant Airport WiFi router to the end of the cable previously connected to the TV and set up a new network. With the TV connected to the new WiFi network (at a distance of about 2 metres) I got speeds of over 200Mbps download as reported by the WebOS speed check tool and 50Mbps upload. Mysteriously, Speedtest in the WebOS browser still reported only (variable) 40-90 Mbps download and 200 Mbps upload. Finally, and again based on hints in this thread, I found the Netflix speed check and that reports 280Mbps. For comparison, my iPhone 12 connected to the same WiFi reports 400Mbps up and down. Tentative conclusion. (1) Software is playing a role, (2) LG seems to have deprecated Ethernet in favour of WiFi, (3) I now have satisfactory speed even if the Cable Matters adapter still doesn't work. I'll still test the adapter when it arrives and put results here.

I have a fairly new LG OLED (OLED55G16LA). I was shocked when I found this page. I had been trying to troubleshoot what appeared to be a flaky network. After a new switch and a new cable I got to the point of plugging the new cable into my desktop and getting 600MB as reported by Speedtest App, then unplugging the cable and plugging it (directly) into my shiny and expensive LG TV and getting (via Speedtest in the LG browser) download speeds ranging from 10-MB up to 60 MB. Curiously I was getting upload speeds of 80-95MB. At this point I began to suspect the Network Interface on the LG and found this thread. I have ordered a USB3 Cable Matters adapter and will report whether it works with my TV model.

I've tested 3 USB-Ethernet adapter, and I'm having no luck. 1- USB 2.0 , gigabit ethernet by Plugable ; this one the TV (a 65C8) 2- USB 2.0, 100Mbit/s ethernet Apple Adapter 3- USB 3.0, gigabit, no idea the brand; I think it came with a Gigabyte laptop for 1 and 2, I get a message about an unsupported USB device has been plugged; no connection is established, switch light doesn't light up. For 3, the little LED on the adapter starts blinking, switch light tells me it's sync a gigabit link. TV gives no message of anykind. Router doesn't give it an IP address. Still no connection. A bit annoyed, I spent my day running CAT6 cable through my wall, only to realise that the TV doesn't support gigabit Netflix app gives me a 98Mbit/s link over ethernet and 128Mbit/s over wifi. Yet, over ethernet re-buffering appears instantaneous (I have gigabit ethernet) Edit: so adapter 3 works when plugged in port 3 and if no other USB device is connected first. I found that it was working if I turned off the TV fully, unplug all other USB devices, plug the ethernet and start the TV. Then you can plug the other USB devices. Not much quicker than via the ethernet port and still slower than wifi