An interaction-contentful-paint performance entry measures the duration of an interaction that causes one or more contentful paints. You can use it to measure LCP for soft navigations in single page apps.

A soft-navigation performance entry measures the duration of a soft navigation in a single page app. A soft navigation is defined as when a trusted user interaction causes a URL update and a visible contentful paint to the screen.

The notRestoredReasons property of a PerformanceNavigationTiming object explains why the current document was blocked from using the back/forward cache (also known as the bfcache) on navigation.

A long-animation-frame performance entry measures rendering updates that take longer than 50 milliseconds. Also known as LoAFs.

A visibility-state performance entry measures the timing of page visibility state changes, such as when a tab is no longer visible or the user has switched to another app.

The window.performance.timing and window.performance.navigation APIs report performance timing information for events that occur during the loading and use of the current page.

The measureUserAgentSpecificMemory() method estimates the memory usage of a web application including all its iframes and workers.

A layout-shift performance entry measures the layout stability of web pages based on movements of the elements on the page. They're used to calculate cumulative layout shift (CLS), a common metric for perceived stability.

An element performance entry measures the time to render elements that have the elementtiming attribute.

A longtask performance entry measures tasks that occupy the UI thread for 50 milliseconds or more, a metric for input latency, delayed animations, and other sources of "jank."

A container performance entry measures time to render child elements, for container elements that have the containertiming attribute.