I've been having some serious issues with lag time recently. Programs take FOREVER to load, they just sit and bounce in the dock - laughing at me. When launching Safari, Word, iTunes - anything, no matter how small or large, the icon bounces - and the computer accesses the hard drive - doing about 2 HD clicks per second.* That goes on for about 30-40 seconds, and then the app opens and runs smoothly. ...Until I move to a different app and then it goes to the HD again.* It's like the computer has ironically forgotten about its memory.* (512 installed) What's going on here??