Extension:NavigationTiming

MediaWiki extensions manualManual:Extensions

NavigationTiming Release status:Extension status beta
ImplementationTemplate:Extension#type	Ajax, Database
DescriptionTemplate:Extension#description	Logs perceived latency measurements from client-side
Author(s)Template:Extension#username	Asher Feldman, Ori Livneh, Patrick Reilly
Latest versionTemplate:Extension#version	0.0.1 (2013-03-16)
MediaWikiTemplate:Extension#mediawiki	1.21+
PHPTemplate:Extension#php	5.4+
Database changesTemplate:Extension#needs-updatephp	No
LicenseTemplate:Extension#license	GNU General Public License 2.0 or later
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ParametersTemplate:Extension#parameters $wgNavigationTimingSamplingFactor
Hooks usedTemplate:Extension#hook BeforePageDisplayManual:Hooks/BeforePageDisplay ResourceLoaderGetConfigVarsManual:Hooks/ResourceLoaderGetConfigVars
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The NavigationTiming extension allows logging perceived latency measurements, exposed by browsers as part of the proposed W3C Navigation Timing, which "defines an interface for web applications to access timing information related to navigation and elements".

What data is logged?

• See the EventLogging schema for NavigationTiming.
• Browsers accounting for about 11% of Wikimedia traffic (as of April 2013) are not supported. See http://caniuse.com/nav-timing.

How is the information used?

Engineers at Wikimedia Foundation intend to use this data to assess the impact (positive and negative) of changes to code or server configuration, and thus to help guide ongoing work on site performance.

Sample configuration

require_once "$IP/extensions/EventLogging/EventLogging.php"; // required dependency
require_once "$IP/extensions/NavigationTiming/NavigationTiming.php";
$wgNavigationTimingSamplingFactor = 10000;  // log 1:10,000 requests.

Additional resources

• Navigation Timing API, specification from the W3C.
• Annotated Timing object: simplified descriptions of the measurements.
• Measuring Page Load Speed with Navigation Timing, HTML5 Rocks.
• Wikimedia Performance: Data from Navigation Timing, performance.wikimedia.org.