Selenium Testing Tools Cookbook

Measuring performance with the Navigation Timing API

Navigation Timing is a W3C Standard JavaScript API for measuring performance on the Web. The API provides a simple way to get accurate and detailed timing statistics natively for page navigation and load events. It is available on Internet Explorer 9, Google Chrome, Firefox, and WebKit-based browsers.

The API is accessed via the properties of the timing interface of the window.performance object using JavaScript.

Each performance.timing attribute shows the time of a navigation event when the page was requested or when the page load event was measured in milliseconds since midnight of January 1, 1970 (UTC). A zero value means that an event did not occur.

The order of the performance.timing events ...