Browser RUM Metrics

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Key Browser RUM metrics are displayed on the Geo, Pages & AJAX Requests, and Usage Stats dashboards. They can also be seen on the All Pages and Top Pages lists and in the Metric Browser.

In addition, the Metric Browser enables you to view these metrics in the context of Ajax requests, iframes, applications, base pages, browsers, devices, and geographic locations.

You can build custom health rules based on Browser RUM Page, Ajax, and iframe metrics in the health rule builder. Use these rules to automatically monitor key metrics in your installation. For more information, see Health Rules.

Browser RUM Timing Metrics Overview

The following provides an overview of the first Browser RUM page and iframe timing metrics. For key Ajax metrics, see Ajax Metrics Availability. Metrics in blue are available only from NavTime browsers. You may see a value of unknown for some metrics taken using older browsers.

When users begin to load the first instrumented page, the JavaScript Agent starts a timer. The timer or the NavTime responseStart starts the first-page timing.

First Page

Subsequent Pages

Connection Details

Because a NavTime browser always sets navigationStart, you can retrieve this information even on the first page a user loads from your site.

NavTiming-capable browsers also provide highly granular information on connection details.

Browser RUM Metrics Defined

Timing metrics are the average times, in milliseconds, over the time range selected in the Controller UI or REST API call. The three-letter abbreviation is the short name as it is recorded in the web beacon.

Name (Short Name)	NavTiming Capable Browsers¹	Browsers without NavTiming Support	Available For . . .	Definition
Ajax Callback Execution Time (DPT)	`responseEnd` to `domContentLoadedEventStart`(context of the Ajax object)	`responseEnd` to `domContentLoadedEventStart` (context of the Ajax object)	Ajax Requests (XHR, Fetch API)	Time for the browser to process the Ajax response. This typically includes the time to apply the response data to the DOM.
Ajax Response Download Time (DDT)	`responseStart` to `responseEnd`(context of the Ajax object)	`responseStart` to `responseEnd`(context of the Ajax object)	Ajax Requests (XHR, Fetch API)	Time for the browser to download the complete Ajax response.
Ajax Request Errors per Minute (Short name based on ARE entries)			Ajax Requests (XHR, Fetch API) App Browser Device Geo	Total number of Ajax requests that generate an error per minute.
Ajax Requests per Minute (Short name based on PLC entries)			App Browser Device Geo	Total number of Ajax requests per minute.
Application Server Calls per Minute			Ajax Requests (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Number of requests that actually hit the application server, rather than a cache.
Application Server Time (also called Server Time in the UI)			Ajax Requests (XHR, Fetch API) App Base Pages Browser Device Geo iframe	Processing time for requests on the application server.
Browser Queue Time			Ajax (XHR, Fetch API) App Base Pages Browser Device Geo iframes
DOM Building Time (DPT)	`responseEnd` to `domContentLoadedEventStart`	N/A	App Base Pages Browser Device Geo iframes	Time for the browser to build the Document Object Model (DOM) and make it available for JavaScript to apply rendering logic.
DOM Ready Time (DOM)²	`navigationStart` to `domContentLoadedEventStart`	Time between the writing of the `starttime` cookie on the previous page and an internal handler's `onready` event, similar to `jquery.onready().`	App Base Pages Geo	Interval between the time that a user initiates a request and the time that the `DOMContentLoaded` event (or the internal handler's `onready` event) occurs.
Domain Lookup Time (DNS)	`domainLookupStart` to `domainLookupEnd`	N/A	App Base Pages Browser Device Geo iframes	Time to complete the domain lookup portion of the server connection time.
End User Response Time (PLT)²	`navigationStart`to `loadEventEnd`	Time between the writing of the `starttime` cookie on the previous page and the `onload` event.	Ajax Requests (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Average interval between the time that a user initiates a request and the completion of the page load of the response in the user's browser. In the context of an Ajax request, it ends when the response has been completely processed. For information about End User Response Time for SPA2 pages, see SPA2 Metrics.
First Byte Time (FBT)²	`navigationStart` to `responseStart`	Time between the writing of the `starttime` cookie on the previous page and when the page's JavaScript Agent begins executing.	Ajax Requests (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Interval between the time that a user initiates a request and the time that the browser receives the first response byte. In the context of an Ajax request, First Byte Time is the interval between the Ajax request dispatch and the time that the browser receives the first response byte.
Front End Time (FET)	`responseStart` to `loadEventEnd`	Time between when the page's JavaScript Agent begins executing and the `onload` event.	App Base Pages Browser Device Geo iframes	Interval between the arrival of the first byte of text response and the completion of the response page rendering by the browser. Includes HTML Download, DOM Building Time, and Resource Fetch Time.
HTML Download and DOM Building Time (DRT)	`responseStart` to `domContentLoadedEventStart`	Time between when the page's JavaScript Agent begins executing and an internal handler's `onready` event, similar to `jquery.onready()`.	App Base Pages Browser Device Geo iframes	Time to make the complete HTML document (DOM) available for JavaScript to apply rendering logic. Includes the HTML Download and the DOM Building Time.
HTML Download Time (DDT)	`responseStart` to `responseEnd`	N/A	App Base Pages Browser Device Geo iframe	Time for the browser to download the complete HTML document content.
Iframe Requests per Minute (Short name based on PLC entries)			App Browser Device Geo	Total number of iframe requests per minute.
Images Loaded per Pageview			Ajax (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Total number of images in a `pageview`. Calculated after page has completely loaded.
Page Complete Time (PCT)	N/A	N/A	App Base Pages Browser Device Geo	Total time for the browser to render all visual page elements (both in and out of the viewport). Available for SPA base pages only. For information about Page Complete Time for SPA2 pages, see SPA2 Metrics.
Page Requests per Minute (Short name based on PLC entries)			App Browser Device Geo	Total number of Page requests per minute. This is the metric displayed across most of the UI.
Page views with JavaScript Errors per minute (Short name based on EPM entries)			App Base Pages Browser Device Geo iframes	Total number of page views that contain JavaScript errors per minute.
Resource Fetch Time	`domContentLoadedEventStart`to `loadEventEnd`	Time between an internal handler's `onready` event, similar to `jquery.onready()`, and `onload`.	App Base Pages Browser Device Geo iframes	Time for the browser to complete the download of remaining resources, including images, and finish rendering the page.
Resources Loaded per Pageview			Ajax (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Total number of resources in a `pageview`. Calculated after the page has completely loaded.
Requests per Minute (Short name based on PLC entries)			Ajax Requests (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Total number of requests (Page + Ajax + iframe) per minute.
Scripts Loaded per Pageview			Ajax (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Total number of scripts in a `pageview`. Calculated after the page has completely loaded.
Server Connection Time (SCT)	`navigationStart` to `requestStart`	N/A	App Base Pages Browser Device Geo iframes	Interval between the time that a user initiates a request and the start of fetching the response document from the server or application task. Includes the time spent on redirects, domain lookups, TCP connects and SSL handshakes.
SSL Handshake Time (SSL)³	`secureConnectionStart` to `connectEnd`	N/A	App Base Pages Browser Device Geo iframes	Time taken to complete the SSL handshake.
TCP Connect Time (TCP)	`connectStart` to `connectEnd`	N/A	App Base Pages Browser Device Geo iframes	Time to complete the TCP connect portion of the server connection time, the equivalent of one network roundtrip of latency.
Total Resource Redirect Time			Ajax (XHR, Fetch API) App Base Pages Browser Device Geo iframes	Time for all redirects associated with fetching resources. Calculated after the page has completely loaded.
Visually Complete Time (VCT)	N/A	N/A	App Base Pages Browser Device Geo iframes	Total time for all visual elements within the first screen (above-the-fold content) to load in an end user’s browser. Calculated using the last visual change to the page in a browser window. For information about Visually Complete Time for SPA2 pages, see SPA2 Metrics.