You need to know what is the specs of the LAN port. Like Pokemon mentioned, it is possibly a 100Mbps LAN port. Having said that, you really don't need a Gigabit LAN on a TV in most cases since it is generally used for streaming. Even at the speed that you get, you can stream 4K contents smoothly.
Thks for sharing. Checked on the router and found MI tv is limited at 100Mbps.