CODEWITHSUNDEEP
google-chrome-devtoolslighthouse
Chinni
Chinni

Reputation: 806

Time to Interactive Vs First CPU Idle

What's the difference between Time to Interactive Vs First CPU Idle.For me in all the reports Time to Interactive is always > First CPU Idle.

Thanks, Raj

Upvotes: 2

Views: 3523

Answers (1)

BugHunterUK
BugHunterUK

Reputation: 8948

The docs define Time to Interactive as:

The Time to Interactive (TTI) metric measures how long it takes a page to become interactive. "Interactive" is defined as the point where:

  • The page has displayed useful content, which is measured with First Contentful Paint.
  • Event handlers are registered for most visible page elements.
  • The page responds to user interactions within 50 milliseconds.

The docs define First CPU Idle as:

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.

The difference being that first CPU time measures when a page is minimally interactive, and time to interactive measures how long it takes a page to become interactive.

Upvotes: 2

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