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RAIL model

RAIL stands for four distinct aspects of web app life cycle:

  • Response: process events in under 50ms
  • Animation: produce a frame in 10 ms
  • Idle: maximize idle time
  • Load: deliver content and become interactive in under 5 seconds

Navigation Timing API

The Navigation Timing API provides data that can be used to measure the performance of a web site.



  • The load event is fired when the whole page has loaded, including all dependent resources such as stylesheets and images.
  • The DOMContentLoaded event fires when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading.


  • First Meaningful Paint
  • Time to Interactive