Page Speed from Google
Currently , there are lot of online/SEO tools avail for analyzing the performance of your websites and optimizing them for better speed, since performance is one important aspect for all webmasters. However if the tools from Google, sure it has got priority.Google had recently released the Page Speed extension for Google Chrome which analyzes the performance and provides you suggestions on improvement or making them faster in loading.
Page Speed Online does not require any installation and you can access it from any browser, at any time. This allows website owners to get immediate access to Page Speed performance suggestions so they can make their pages faster.Just enter a URL and get instant suggestions for performance improvements on your site. Page Speed Online provides your site a score and breaks down suggestions by their priority