Ok here are my first few thoughts after a quick test with the adapter posted above.
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Installation is no problem at all, just plug it in, plug the lan cable in = ready to go
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Tested playback and skipping forward on a 63gb 4k Movie (90mbit/s)… a huge difference compared to the internal ethernet port!! It skips almost immediately, tested 10 second jumps, 10 minutes jumps and chapter jumps… the waiting wheel is almost not visible anymore. With the internal adapter, I had the wheel go from 0% to 1% to 2% to 9% to continue playing, which was roughly 1.5 seconds… now I only see a very brief flash of the wheel and playback continues… It finally feels like it felt with the shield tv with its gigabit port.
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Had trouble getting iperf to work but since the adapter has the exact same chipset as the mentioned asus adapter in the first post, it probably has the same speed, which is maxing out the usb 2.0 speed
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no fstab being used, just normal samba shares with my NAS (Synology DS216+II)
So summary, the adapter improved my Vero 4k experience just the way I had hoped. I will continue to use it and monitor the performance. Long term stability of course is a huge issue, this quick test obviously does not cover that. But the first impressions are great. I put great value at the responsiveness of my devices, everything has to feel immediate and snappy.
edit: the network settings I use are buffer = 1073741824 with readfactor = 5