Yslow is what I would consider to be an essential tool to any SEO or developer’s toolbox. I am a big fan of tools and methods that help you improve the structure and architecture of your website, and YSlow is the perfect addition to FireFox to help you analyze, dissect, and improve a your website’s structure and load times.
After installing the YSlow plugin on FireFox, simply run it on any domain and it gives you the following breakdown:
YSlow gives your site a composite grade based on a total of 22 different contributing metrics. Each metric is analyzed in order to help you crack down on page load times and code structure of your website. YSlow will give you a grade on each metric to help you determine which areas of your site need attention.
As you can see on the screenshot, when I ran YSlow on xkcd.com – it scored an F for “Content Delivery Network”. From here, you click on the grade and YSlow gives you a breakdown of which components contributed to the score and a link on how to fix them at the bottom if you’re not sure how.
I personally rely on YSlow often to get a snapshot of client webpages. YSlow is a great way analyze things like http requests and how css/javascript are performing.
Especially considering its a free tool, there really isn’t a reason you shouldn’t be using YSlow!
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