Extension:NavigationTiming

MediaWiki extensions manual

NavigationTiming Release status: beta
Implementation	Ajax, Database
Description	Logs perceived latency measurements from client-side
Author(s)	Asher Feldman, Ori Livneh, Patrick Reilly
Latest version	0.0.1 (2013-03-16)
MediaWiki	1.21+
PHP	5.3+
Database changes	No
License	GNU General Public License 2.0 or later
Download	Download snapshot (Git master) Git [?]: repo summary browse file tree commit history code review README
Parameters $wgNavigationTimingSamplingFactor
Hooks used BeforePageDisplay ResourceLoaderGetConfigVars
Translate the NavigationTiming extension if it is available at translatewiki.net
Check usage and version matrix; code metrics
Issues:	Open tasks · Report a bug

The NavigationTiming extension allows logging perceived latency measurements, exposed by browsers as part of the proposed Navigation Timing API, which «defines an interface for web applications to access timing information related to navigation and elements».

§What data is logged?

• See the NavigationTiming JSON EventLogging schema.
• Browsers[1] accounting to about 11 % of WMF's requests (as of April 2013) are not supported.

§How is the information used?

Engineers at the 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: draft specification from the W3C
• performance.timing object: simplified descriptions of the measurements available.
• Measuring Page Load Speed with Navigation Timing
• Wikimedia Stats: Frontend Page Load Timing