Some time ago I found this great blog-post about how to prioritize the Ethernet connection over Wi-Fi. In my case this is when I’m at home.

Sometimes, your Mac will connect to a janky Wi-Fi network. The connection is slow or you’re on the other side of a lead wall and you’re getting a really poor signal. When you finally find an Ethernet jack to plug into, you may notice you’re still connected to the Wi-Fi network that was giving you problems. This is because your Network Service Order list is out of its proper order to allow the Ethernet to take over when plugged in. Don’t fret, we’ll show you how to reset the Service Order list on your Mac to ensure that Ethernet takes priority over AirPort.

Read the full post at maclife.com