A Dotcom-Monitor waterfall chart is a bar-chart type data visualization that sequentially displays both the individual performance and cumulative effect of individual webpage-elements loading in a browser.

Waterfall charts are generated as part of a performance report, and are accessible from online reports by clicking on the detail link under response status:

PerformanceReportDetail

A Waterfall report is also generated after each playback of a Userview script in the Everystep Scripting Tool.

waterfall_chart

The load-time for the individual aspects of each webpage-element is displayed within the waterfall chart, including: Domain Name Server (DNS) resolution time, Connection, SSL, Request, First packet, Download, Start Time, End Time and Speed (in bytes per second (bps), and kilobytes per second (kbps)).

Viewing a Waterfall Chart Video: