Chris,
Check out your wireless router and see how fast it is. Are you on a N wireless network, for example? If your wireless access point is more than three years old, an upgrade might be in order. However, be certain the wireless cards of your laptop can handle the faster speeds.
http://compnetworking.about.com/cs/wireless/f/wirelessspeed.htmOf course, wired will always be faster.
JamesNT