“Speed Index” introduced as new performance metric

The Speed Index metric was added to WebPagetest in April, 2012 and measures how quickly the page contents are visually populated (where lower numbers are better).  It is particularly useful for comparing experiences of pages against each other (before/after optimizing, my site vs competitor, etc) and should be used in combination with the other metrics (load time, start render, etc) to better understand a site’s performance.

https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/metrics/speed-index

 

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