If you own a website, then it is good to check their performance now and then. Various factors affect the site speed, and it’s better to use some tools to do the job for you.
YSlow is a similar tool from Yahoo!, that analyzes web pages for performance. It is available as a browser extension and has one for all popular ones. It provides a grade for the web page based on a predefined ruleset or a user-defined ruleset. The grade is calculated based on the YSlow Ruleset Matrix.
I have been implementing some of the recommendations from the above tools on this blog, but as you can see from the above results, there is still more to be done. Hope you find this helpful for your sites.