04-26-2013, 05:41 PM
What is the major difference b/w Visual Progress (%) and Visual Progress - Dev Tools(%) metrics when you perform a visual test? Which is a better indicator of speed?
(04-27-2013 11:42 PM)pmeenan Wrote: [ -> ]The "Visual Progress (%)" uses the screen shots/video and looks at the pixels of the end state to determine the progress. It works well a lot of the times and is the original method but it falls apart a bit for pages with large interstitials or slideshows that auto rotate.
The "Dev Tools" version is a newer version of the algorithm that tracks every paint event and deals with pages that update and change better: https://sites.google.com/a/webpagetest.o...int-Events
The Dev Tools version tends to be more consistent and works best for Chrome but I'm looking into making it more robust for the other browsers as well. Eventually the plan is to move to the Dev Tools version of the metric once I'm comfortable that it works better across all of the browsers.
Another benefit is that it can be captured without having to capture video.
(05-23-2013 10:05 PM)pmeenan Wrote: [ -> ]Not currently but it shouldn't be too hard to add to the JSON and XML interfaces. Would that work?