http://www.onlinegamingfun.com/blocking-online-gaming-ports/

Internet slower on one computer then other?
My home has 3 computers in it. All connected by a Linksys 4 port wireless router. The main computer that has the router itself goes at roughly 150 KB a second. However the others, well the one I use at least, runs at only 6, to 12, KB a second. It uses a Linksys wireless adapter to connect, is there any way to speed up my internet connection? I’m tired of being kicked from online games or disconnected when using this computer and its slow speed, and it isnt a firewall blocking it, as all the computers have the same brand of firewall.
I forgot to mention, that I’m unable to either get a cable for wired connection (30 foot cable and nowhere to run it that wouldn’t cause a problem. Also i cant move the computer closer.
are you using security measures like packet encryption? then you speeds will be reduced on wireless
you simply cannot beat or get the thoroughput of a hard wire connection
How to open a port in Inteno (how to make online games work)