I have the TV and the Router in opposite sides of the house. However, when I switch the TV off, the network runs at top connectivity - almost instantaneous. I've tried to change the Channel to 11 (recommended for OZ), but couldn't on the D-Link it stays on channel 1 (perhaps theres som ehelp out there to chance channels on the D-Link).
I also have an Ethernet connection on the D-link as well; and that link runs OK. So I think the Bravia interferes with the signal.