Upgrade Your Hardware
Fiddling with the apps and files on your disk can solve many problems that decrease your Mac’s performance, but if you want to make your Mac faster than the day you bought it, you may need to undertake some hardware modifications. These range from easy and inexpensive (yet incredibly effective) to expensive and scary (while not so effective). But if you’re serious about speed, you’ll almost certainly do at least some of these things.
I’ve mentioned RAM many times in this book because the correlation between free RAM and speed is so strong. By now I hope I don’t have to convince you how valuable it is, but you may still be wondering how much RAM to add, where to get it, and how to go about installing it. Allow me ...