Since updating my MacBook Pro OSX Lion, my system suffers from intermittent freezing. These frosts are not the same as the others mentioned here; they do not affect start-up or logging, or troubles with video playback.
During these episodes the following is always true: RAM is not accessible. At least one quarter of the provision. No system is not running a lot of applications. No more than I used to run in Snow Leopard. A coworker also has a MacBook Pro and is located in Lion, and had no freezes at all. We compared run applications, and are no different.
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