Xbox 360 and Airport Express

Hey guys,
Just moved into my apartment and i bought an airport express do go with my comcast internet and play Xbox360. BUT my connection is VERY LAGGY and its really starting to annoy me. I simply cant keep up with everyone because of my connection. I know some people people say i need to tweak with the settings in the airport express but i dont know how. If anyone could please help me out with this i would greatly appreciate it.
thanks
jmurr

How do you know if it is your Airport Express - or your network in general - or interference with surrounding networks?

Truthfully I tend to connect my gaming systems directly to a wired network to avoid any dropouts/interference with wireless.

Most setttings are tweaked through the Airport Utility - but you need to verify it is the Express that is causing the lagginess before tweaking anything.

Yes I'm sure it is the airport express because I've connected straight from the modem into the xbox and my ping is fine. ie. playing call of duty- on the right side of the scoreboard is each player's ping. When it's going through the wireless- its yellow or orange. BUT direct connection its green.
thanks for the response.
I know the tweaking is done in the airport utility but I don't really know what to do. networking isn't really my thing.
If anyone could help I'd appreciate it.
Jmurr