So, is there any possible that my Macbook use more ram when I use two screens?
First - in MB, second - Cinema Display. Also when I use only Cinema Display, MB used little less ram. Am I crazy?
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Not crazy at all. All that extra data has to be stored somewhere, even if it is just a million pixels or so. I've even met some graphics cards that really don't like two screens at all. It's not that they're out of RAM, or my system is out of RAM, it just gets handled inefficiently. I would reckon to bet that you'll see performance changes across the board when hooking up that second screen, though likely nothing truly significant.