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.
<div>
{{APIREf}}</div>
<p>The Web Performance API allows web pages access to certain functions for measuring the performance of web pages and web applications, including the <a href="/en-US/docs/Navigation_timing">Navigation Timing </a>API and high-resolution time data.</p>
<h2 id="Methods" name="Methods">Methods</h2>
<dl>
<dt>
{{domxref("window.performance.now", "performance.now")}}</dt>
<dd>
Returns a high-resolution timestamp.</dd>
</dl>
<h2 id="Properties" name="Properties">Properties</h2>
<dl>
<dt>
performance.timing</dt>
<dd>
---</dd>
<dt>
performance.navigation</dt>
<dd>
Provide access to the <a href="/en-US/docs/Navigation_timing">Navigation Timing</a> API.</dd>
<dt>
<a href="https://docs.webplatform.org/wiki/apis/timing/properties/memory">performance.memory</a></dt>
<dd>
A non-standard extension added in Chrome.</dd>
</dl>