How to read a WebPageTest waterfall chart

WebPageTest is one of the most well known and important tools in the web performance community. It’s been actively developed by Pat Meenan since he worked at AOL in 2008. It has become the go to tool for both very simple to very advanced debugging of the web performance of a website. One of its most well known charts is the waterfall chart.

In this talk I’m going to introduce the waterfall chart and also go into detail on how you can examine and read it. The more you understand about the chart, the the more WebPageTest as a whole will be able to help you fix a slow performing website.


Link to Matt’s ‘Nooshu’ website’s blog entry on:
How to run a WebPageTest test

Link to Matt’s blog entry on the:
Vary Unusual Waterfall use case

Matt’s list of additional resources:

List of Twitter handles for peeps Pat recommends: