Have a 2008 2.0 gHz unibody, 2 gb memory, and 160 gb hard drive. Recently, the laptop became agonizingly slow on boot up and waking from sleep. Also noticed that Safari was using mucho memory - sometimes up to 900 mb. Tested the drive with Onyx, Smart Utilities, and Smart Reporter. The only problem reported was by Smart Utilities, which said that it was failing - had two (only) sectors reallocated. Went ahead and (easily) replaced the drive with a Western Digital 7200 rpm - 320 gb. The laptop is noticeably faster on boot up, and waking from sleep. Programs also open faster. Makes me think that the two year old hard drive may have been a problem Unfortunately, Safari is still a hog and I am considering ordering 4 gb to upgrade memory. Before I do, I wanted to ask if anyone has advice about settings, etc. However, I have already disabled a lot on the browser (RSS, etc.). Would seem like 2 gb should be enough for my use. Thanks in advance.