I've got to admit that although I knew a good number of these suggestions, there were a couple that I did not know at all. Yes, YSlow does tell you the 'how to make it better' part, this book gives you more details on what happens behind the screens for some of the rules.

The other reason I liked this book was because this is pretty much the one place where I have to come to get all the information. I added a couple of optimizations to my website while I was reading this book myself.

All-in-all, well worth the time reading it. ( )