A big change in the World of Performance for 2015
is the shift to metrics that do a better job of measuring the user
experience. The performance industry grew up focusing on page load time,
but teams with more advanced websites have started replacing PLT with
metrics that have more to do with rendering and interactivity. The best
examples of these new UX-focused metrics are Start Render and Speed
Index.
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Whereas start render time captures when the rendering experience starts,
Speed Index reflects how quickly the entire viewport renders.
http://www.stevesouders.com/blog/2016/02/10/critical-metric-critical-resources/
https://speedcurve.com/
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