Webpagetest is an online tool for website load speed analysis. You can choose from a variety of locations, it gives scores for certain indicators, displays the first page load time and re-feed time, and you can also compare the site load speed with previous tests from the history.
One of the cool features of WebPageTest is that it can generate a filmstrip of screen snapshots taken during a web page load, enabling us to quantify how a page loads, visually. This view makes it significantly easier to determine how long the page is blank for, and how long it takes for the most important content to render.
Being able to look at the results in this way, provides the ability to empathise with the user.