This article is a continuation to my article about FirebugYSlow is an add-on to Firebug that helps developers determine why a site is loading slowly.

After you install YSlow, if you open up Firebug in Mozilla a new tab will now appear called "YSlow".  The next steps would be to load a web site that you want to check it's performance.  After the web site has loaded, click the YSlow tab, if the results don't compile automatically, click the Performance button to run the diagnostics.

The grading is made up of 13 steps.  For each step you receive a grade from A to F.  An overall grade is compiled in the same format.