Want to know why your web page load slow. Here is a simple and powerful Mozilla Firefox add-on tool known as YSlow that analyzes web pages and tells you why they're slow based on Yahoo's rules for high performance web sites.
YSlow gives you :
- Performance report card
- HTTP/HTML summary
- List of components in the page
- Tools including JSLint
- You must have Mozilla Firefox. (You can download it from Right Sidebar for free)
- You must have Firebug add-on installed in your Firefox. In case you do not have, you can install Firebug from here.