Number of frames in the page.
Number of events in the page.
Total JavaScript heap size.
Used JavaScript heap size.
Total number of full or partial page layout.
Combined durations of all page layouts.
Number of DOM nodes in the page.
Total number of page style recalculations.
Combined duration of all page style recalculations.
Combined duration of JavaScript execution.
Combined duration of all tasks performed by the browser.
The timestamp when the metrics sample was taken.
Number of documents in the page.