Might I suggest you do more then skim the big red words and instead read the paragraphs below said big red words before commenting. The first thing on the list is YSlow, followed by the text"…which makes use of the popular web development tool, Firebug…"
Also, I'm partial to Safari/WebKit's Web Inspector. But thats just me.
(i was expecting thing like gzip, use of cdns, memcache, js compressors etc)