I have a late-2008 aluminum unibody MacBook with OS X 10.7.4 and in the last couple months it's started getting really slow especially when loading up Chrome or Firefox. I've kept it up to date with software updates for the OS and all the applications I use. I don't know much about Mac OS X and certainly don't know anything about determining the cause of a performance loss. I'm a PC guy and have troubleshot and repaired PCs with all flavors of Windows and a few of Linux for the last 10+ years, but I'm stumped when it comes to Mac. I've had no reason to dig too deep into the innards of the OS yet. I'm just asking for some help on which way to go from here to figure this problem out. Thanks.