Google sponsors tool to test your website speed

WebPagetest is an open source project that is primarily being developed and supported by Google as part of their efforts to make the web faster . The online version at www.webpagetest.org is run by the WPO Foundation for the benefit of the performance community with several companies and individuals providing the testing infrastructure around the globe.

At its core, WebPagetest is used for measuring and analyzing the performance of web pages. There are a lot of options that may seem intimidating at first but doing quick testing is pretty simple.

Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds.
You can run simple tests or perform advanced testing including multi-step transactions, video capture, content blocking and much more.
For documentation visit: https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/quick-start-quide

Your results will provide rich diagnostic information including resource loading waterfall charts, Page Speed optimization checks and suggestions for improvements.