I wanted to give an overview & awareness of all performance areas, not just the focus of the book (systems). So topics like runtimes (and GC), queueing theory,

I wanted to give an overview & awareness of all performance areas, not just the focus of the book (systems). So topics like runtimes (and GC), queueing theory, etc, are summarized in less than a page in a 600+ page book. A big problem with performance is gaps in people's knowledge (unknown unknowns -- which I referenced in the intro), so I wanted to at least create awareness of them (to become known unknowns). But I bet that's frustrating if I've hit an area you want to know a lot more about. Areas like systems performance methodology I've written a lot of new material for in the book in more depth.