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lwp-request is a free Web agent that ships with Perl's LWP module. To get it, CPAN install LWP.
The -S option shows the HTTP response chain, including redirects.
The -d option just prevents dumping the HTML of nerdabout.com, to the terminal :)
This pseudo-HTTP waterfall mock illustrates a situation which applies to a lot of web sites out there which have legacy code, mixing inline and external script elements and so on.
This was drawn thinking about how inline and external JS (red) elements block and interfere with page load and rendering. We do a pretty good job of "rolling up" our JS, but there is still a lot of up-front time spent in load and parse, which subsequently affects render.
The less script loaded/parsed up front, the faster you should be able to show a page to the user and affect perceived performance, loading, and so on. YUI 3 does a good job of this with their "seed" loader and new asynchronous-based constructor/require() nature.
Needless to say, ideas are being tinkered with.