Ok, I am having a couple little problems with Mavericks. Nothing to serious, but it bugs me. First is, when I close the lid, it takes 30 seconds to a minute to go into sleep mode. Second, I randomly see the beach ball pop up for a split second at random times. Third, sometimes the laptop won't let me scroll. Haven't had that in the past 12 hours or so, but it has happened since I installed. My specs are 8GB RAM, 320GB 7200RPM HDD, 2GHz C2D.