WebPageTest is a free and open source Web Performance audit tool. It has several advantages:
- We can run tests from many locations around the world, on real devices and real consumer connection speeds;
- We can analyze a treasure trove of performance data, including a full-featured Waterfall graphs, performance metrics and details on every asset;
- We can understand the actual user experience in conditions we may not be familiar with using the filmstrip and video features;
- We can compare side-by-side two websites, or two different versions of the same website, to better diagnose performance issues
To start using WebPageTest, head to http://webpagetest.org/easy, enter the URL of the webpage you want to audit, wait a few minutes and you can see the results of your audits.