Today, I’ll introduce YSlow, an add-on for Firefox.
YSlow was born out of Yahoo’s development department after they wrote some best practices for making high performance web sites. All the gory details are found in their Best Practices for Speeding Up Your Web Site document.
You might know that Firefox has thousands of add-ons available to help you with all sorts of things, and to be accurate, YSlow is actually an add-on to the Firebug add-on for the Firefox web browser.
Screenshot of FireBug with YSlow installed.
YSlow has four sections: Grade (grading performance), Components (listing web page components), Statistics (statistic on web page components) and Tools.
The Statistics tab compares the page loading (total file size, to be exact) when components were not cached (saved from previous visits) verses when they components were actually cached when you ran the YSlow test.
My next post will delve a little deeper into YSlow.