only on V11?
are you running the dedi on the same comp your playing from yourself? or a comp that is being used for other apps or games at the time and the dedi is minimized?
a dedi server usually implies its running on a dedicated computer also. so that the active winow memory, or just memory is allocated properly.
the same reason why a game lags when the host will run firefox or whatever over his screen while in game.
unless its something else