Hmm, I have put mine upstairs then use an ethernet connection from it to the pc. Of course the extension to whenre it is would could some slow down, but I still cant get my head around the fact that my last modem and 1GB connection was getting me pretty much the same speed?
having the hub next to tv is for bt vision. just try swapping back to your old router and do speed test again. Like i said in other post let me know your number and i will talk you through it if you want.