While broadband has increased connection speeds for most users, site performance remains important as more and more views come from users who access a site with a mobile connection. In this presentation we will outline the basics of understanding how a site performs using the results of waterfall charts with a focus on the performance tools provided by Webpagetest.org. The presentation will begin with the basic configuration of a test and then cover some of the more advanced scripting features available and their uses. Results of tests will show the differences in loads of a site in both the HTTP/1.1 protocol and HTTP/2 and what is needed to capitalize on the latest protocol. We will also discover how the waterfall tests can provide clues to other performance problems of a site and next steps needed to identify bottlenecks that hinder site load.