When you need a connection that requires maximum speeds as well as stability, that connection should be always be wired. Some examples include cable and satellite boxes, security cameras, Apple TVs, Smart TVs, gaming PCs, gaming consoles and devices used for high quality entertainment like 4K video streaming. Additionally, when your connection requires low latency (lag), it should always be wired.
The best way to remember what you should wire: if the device has an Ethernet port, use it. But when doing so, do not forget to turn off the WiFi connection to the wired device. At the most basic level, getting the most speed out of a wired home network relies on three things: the router’s speed, the capabilities of the device that is using the data and, of course, the Ethernet cable’s data-carrying capacity.