window.performance

The Web Performance API allows web pages access to certain functions for measuring the performance of web pages and web applications, including the Navigation Timing API and high-resolution time data.

Methods

performance.mark()

Maps a DOMHighResTimeStamp to a specified name representing the amount of milliseconds elapsed since a reference instant.

performance.now()

Returns a DOMHighResTimeStamp representing the amount of milliseconds elapsed since a reference instant.

Properties

performance.timing

Is a PerformanceTiming object containing latency-related performance information.

performance.navigation

Is a PerformanceNavigation object representing the type of navigation that occurs in the given browsing context, like the amount of redirections needed to fetch the resource.

performance.memory

A non-standard extension added in Chrome.