Note from Jimmy Hua:
Another site that was posted from Alissa’s site. The biggest downfall of this is that the site needs to be accessible from the public internet. Other than that, it is a golden tool. It pin points slow downs in your site and gives you recommendations to improve the speed of your site’s load-up. It is definitely a tool that is useful for all web engineers.
This post is shared through my Google Reader from another source. All credit of the post belongs to them which you can access by going to GTmetrix | Website Speed and Performance Optimization
Cool tool for analyzing website performance. Includes a breakdown with suggestions for improvement.