WebPageTest | Networking Performance
WebPagetest is an open source project that is primarily being developed and supported by Google.
One has the option to either use the online version at www.webpagetest.org manually or via APIs, or run a private instance of WebPagetest.
WebPagetest allows one to run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds. One can run simple tests or perform advanced testing including multi-step transactions, video capture, content blocking and much more. Test results provide rich diagnostic information including resource loading waterfall charts, Page Speed optimization checks and suggestions for improvements.