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
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.