Yeah, this router is running entirely vanilla, deliberately so just to make sure that there was nothing in the way of it...
... I might end up upgrading it to v24 (it's running v23 SP2 at the moment) and see if that makes any difference. I might even end up swapping out the linksys for the buffalo DD-WRT router, though that'll involve configuring that to get an IP (currently just using that as a switch on my DSL network)... it seems a bit snappier loading the admin pages too, so might end up changing for that reason
right, off to upgrade... I'll do a full reset first and see if that makes a diff.