MGC won't be the hog here, but running the searches spikes the server usage on the dB etc. Adding the chatbox to that would realistically be pointless. I say this because what happens after you run the search? You either hit the back button, or click one of the results. Same with the whos online. Who's online refresh automatically so that would add a huge usage if a user sits there and replies in the chat while the who's online keeps rereshing.
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