Sorry, it's hard for me to understand still exactly what you're talking about up there.
How much stuff is on the network entirely? Multiple ports are being used you mentioned, for other PC's or peripheral devices I assume???
What exactly do you want out of your question lol...faster internet overall for your machine? Or an upgrade in connection speed. 802.11g is 54mbps and the standard nowadays...won't get much better than that unless you go gigabit 1000mbps hardwired...which is "connected" at that, but you won't see that speed. For sure.