Having things plugged into a hub will degrade their performance, that is just the nature of a hub. I'm sure most if not all usb hubs now days have multi-TT. If it was just comming out when toms reviewed it a year ago it is probably on everything now.
If you haven't already, try a Belkin USB2 Hub. We are using several of those where I work and they have been very nice.
<A HREF="http://www.folken.net/myrig.htm" target="_new">My precious...</A>