Big Lag When 2nd Computer Is Connected :(

[HeyaEveryone]

Hello,

I have two computers connected to the internet through the same network (linksys wrt54gs router) One computer is wired, one is wireless. The problem is, once the wireless computer logs onto wow (it's fine if it's only connected to the internet) but once it's connected to wow, both computer 1 and 2 start lagging pretty hard. My latency goes from 50-60ms to around 700ms on both computers.

This didn't used to happen, but since the patch is when it seems there is a problem. Could be totally unrelated, it's just when it started.

Any suggestions are very welcome, I'm stumped .

Thanks so much,
Heya