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First CPU Idle


The First CPU Idle metric measures when a page is minimally interactive:

  • Most, but maybe not all, UI elements on the screen are interactive.
  • The page responds, on average, to most user input in a reasonable amount of time.

See also Consistently Interactive.


There are two general strategies for improving load time:

More information

The score is a lognormal distribution of some complicated calculations based on the definition of the First CPU Idle metric. See First Interactive And Consistently Interactive for definitions.

Audit source


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