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:
- Minimize the number of required or "critical" resources that must be downloaded or executed before the page can load. See Critical Rendering Path.
- Minimize the size of each critical resource. See Optimizing Content Efficiency.
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.
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