uses slower 10/100 Ethernet on the Fire TV Cube and other devices because you really don't need a faster Gigabit connection — even if you really want it.
Why went with slower Ethernet on the Fire TV Cube
Fire TV - Wikipedia
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Our fastest ever streaming media player is 2X as powerful as the Fire TV Stick 4K maximum. With a new octa-core 2.0 GHz processor at the center, you can launch and navigate apps quickly. Fire TV Cube also features Wi-Fi 6E support for smooth streaming and additional ports so you can connect and control other entertainment devices with just your voice. It's our most advanced streaming media player that delivers every time you hit play.
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Why is my speed test for ethernet on the new cube slower than wifi? : r/ fireTV
Belkertech Ethernet Adapter, USB Network Adapter/Micro USB to Rj45 Ethernet Adapter, USB to Rj45 Cable for Fire TV Stick, All-New Fire TV, Chromecast Ultra Audio Etc : Electronics