NavigationTiming
NavigationTiming is a MediaWiki extension for logging perceived latency measurements, exposed by browsers as part of the Navigation Timing API.
Example configuration:
// Dependency
wfLoadExtension('EventLogging');
$wgEventLoggingBaseUri = '/event';
wfLoadExtension('NavigationTiming');
$wgNavigationTimingSamplingFactor = 100; // log 1:100 requests
For more information, see the extension's documentation on mediawiki.org: