Also, one more thing I'd draw attention to - if you look closely, you will discover that the game in fact renders only the compartment you're in + ones immediately adjacent. It does hide the others quite cleverly to save graphics processing power.
So again, I really don't believe that the extra crew will be a major issue for performance.
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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