We already wrote about 14 rules to increase website loading time and to detect the issues using Yahoo YSlow. Google Webmaster Central introduced page speed an open source Firefox/Firebug add on, which detects the website loading time.

Page speed analyzes the page speed and give suggestions to improve and optimize your web page.

Page speed gives reports and suggestions for the following 20 issues

1. Leverage browser caching
2. Minimize DNS lookups
3. Optimize images
4. Avoid CSS expressions
5. Enable gzip compression
6. Specify image dimensions
7. Remove unused CSS
8. Serve static content from a cookieless domain
9. Minimize cookie size
10. Use efficient CSS selectors
11. Combine external JavaScript
12. Leverage proxy caching
13. Minify JavaScript
14. Combine external CSS
15. Minimize redirects
16. Put CSS in the document head
17. Serve resources from a consistent URL
18. Parallelize downloads across hostnames
19. Defer loading of JavaScript
20. Optimize the order of styles and scripts

Page speed an additional add on for Firebug, so it is required  to be install Firebug add on in your Firefox browser.

Screen shot of  Page Speed Firefox/Firebug add on

Screen shot of Page Speed activity