I've heard people doing this to speed up their Mac. How would I do this? All of a sudden my iMac got really slow. I've tried everything from repairing disk permissions, getting rid of old files, etc. I've only had it for about a year and don't do much on it other than surf the internet, iTunes, and iPhoto. I use Safari for my browser and have 2GB of memory with a lot of free space. My internet provider came out to my house the other day to check on my connection and it was perfect, I even upgraded my speed for my modem. I'm also currently using Time Capsule for my router. thanks for any help.