Curious Question

if both are connected, ethernet trumps wireless

 

Welcome!

So you're plugging your macbook into an ethernet port on your wireless router, while simultaneously connected to the same router via wireless?

...Wired takes priority. Although, I'm sure either connection is far faster than your internet connection.

 

indeed, even a most basic and cheap router gives much faster speeds that ISP offer to the consumers. The only reasons people actually get the higher end one is the range, the USB ports, and ofcourse the network transfer, which will effect the old Apple TV and just range file sharing or home server data transfer rate

 

you should turn off airport when using ethernet, no need to put extra mileage on your airport card