Apparently you feel that TUI includes a magic elixir to adjust for lack of bandwidth far upstream(?) His PC settings likely aren't the issue since he does not state this service underperforms during other times. Also, IME changing the MTU settings (something you may be alluding to) is not usually necessary in Vista or 7. As an IT person I normally don't encourage anyone to go make registry changes without having a few more laps around the track.
In Post#9 of this thread he states the HDTV is connected directly, so I will repeat, TUI or lack thereof won't be affecting his situtation.