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Since April 2015 I have been seeing a lot of references to the RAIL concept (Response Animation Idle Load) being made on blogs and in conferences as a way of evaluating the performance of user interfaces. I am not able to find the origin of this term. Who coined this?

URLs:

http://q42.com/blog/post/116938038438/it-was-a-smashing-conf

http://publishing-project.rivendellweb.net/web-content-optimization-rail-putting-the-user-first/

3

It came from Google

RAIL is a UI performance metrics framework created by the Chrome dev team. They use it to gain focus on the various aspects of responsiveness within the app itself and as a guideline to developers in the wild to improve the web app ecosystem.

A well articulated explanation was recently offered at the Chrome Dev Summit. As you noted in your comment, it has been spoken about throughout the year at other events such as the Loop Conference in the Spring.

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