I have a BT Homehub version 1. The wifi works fine.
But when I connect a computer using a cable the internet connection is extremely slow and I can barely load a web page. This also slows down the internet connections of the wifi devices to the same extent.
I have tried various cables (both straight through and crossover), different ports and different computers but still get the same problem.
Possibly a faulty homehub?
are you sure your drivers for your network card are up to date?
Our daughter has a HH2 and we find her ethernet connection is slow if she leaves the wifi connected - if she disables the wifi - the ethernet zooms along (as fast as 1.5 Mb can zoom).
Not sure if your're leaving your wifi on, if so may be worth a try.