Wired is usually faster however the question is....do you have other people connected by wired as well?
My sister and my computer are connected by wire. When I'm online by myself my pings are about 40 - 60 .......when her computer is on at the same time. My pings skyrocket from 800 - 1400.
My ps3 is also connected by wire and when either of our computers are on. Games are practically unplayable. LBP lags so much i can't make simple jumps, MAG won't even connect etc. etc.
If your connection is the only one using a wire then yeah it will be faster.
CURRENTLY PLAYING: Warframe, Witcher 2