I had a real problem when I arrived at Joyent, people would complain about page load times, web apps “feeling slow”, or judgments on server performance based on page serving. What I needed was a way to quantify page loads so that I could measure the effects of change to the underlying structure. Did tweaking PostgreSQL’s query cache actually help? How much did it help? Whats the effect of turning this nob? These are all questions that I had a very hard time answering.
Then about 2 weeks ago Joyent super-support engineer Josh Roebuck mentioned Fasterfox which provides “performance and network tweaks for Firefox”. Of its features the most interesting one to me was a time counter at the bottom of the browser that it adds to measure page load times in seconds. Finally the solution I’d needed! Now I quantify exact performance improvements!
Besides just telling me how my app performs its great for quantifying the speed of other web applications. For instance, people have wanted Joyent Connector, our Web 2.0 Collaboration application implemented in Rails, to be as fast as Gmail. I was happy to find that we’re about par for page load times! Mind you, getting to that point was a lot of work, but we’ve done it… not only can you send mail to and from Joyent Connector as fast as Gmail can but we can also load pages as quickly and in some cases more quickly with much more functionality.
So, before you complain about web performance make sure to download Fasterfox and have numbers to show, and if your a developer have numbers to help you tune and then use to gloat to your manager. 
There are two separate Firefox addons which help greatly with this:
https://addons.mozilla.org/firefox/3371/
http://tamperdata.mozdev.org/
I prefer the view in TamperData but they both give you some nice charts for page load-time. The key part is that they both break the load-time down by the individual page components (e.g. stylesheets currently load serially in-order, which is a huge slow-down due to network latency) and might help you flush out problems with your cacheability (e.g. making CSS, JS and image files expire well in the future helps make pages load much faster; I recommend the approach of using versioned filenames and having the HTML files use short expirations (dynamic content usually forces this anyway) so infrequently-changing content be cached for days/weeks, which will significantly reduce page-load time.)
On your Macbook Pro, consider firing up Safari, enabling the hidden debug menu first:
% defaults write com.apple.Safari IncludeDebugMenu 1
Then checkout Debug -> Show Page Load Test Window
More info here – http://webkit.org/blog/?p=75
HTH,
j.
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