Hi, I just submitted my site to https://developers.google.com/speed/pagespeed/insights/ and I get: Consider Fixing: Leverage browser caching: Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network. Leverage browser caching for the following cacheable resources: http://www.xxx.com/w/load.php?debug=false&lang=en&modules=mediawiki… (5 minutes) http://www.xxx.com/w/load.php?debug=false&lang=en&modules=site&… (5 minutes) http://www.xxx.com/w/load.php?debug=false&lang=en&modules=site&… (5 minutes) http://www.xxx.com/w/load.php?debug=false&lang=en&modules=startup&a… (5 minutes) This is because by not logged in users, the resource modules are being requested without "&version=..." since in OutputPage.php it sets $version = null; if ( $group === 'user' ) { // Get the maximum timestamp $timestamp = 1; foreach ( $grpModules as $module ) { $timestamp = max( $timestamp, $module->getModifiedTime( $context ) ); } // Add a version parameter so cache will break when things change $version = wfTimestamp( TS_ISO_8601_BASIC, $timestamp ); } with the comment: we shouldn't be putting timestamps in Squid-cached HTML and then in the end when the request is handled it runs: if ( is_null( $context->getVersion() ) || $errors ) { $maxage = $wgResourceLoaderMaxage['unversioned']['client']; $smaxage = $wgResourceLoaderMaxage['unversioned']['server']; // If a version was specified we can use a longer expiry time since changing // version numbers causes cache misses } else { $maxage = $wgResourceLoaderMaxage['versioned']['client']; $smaxage = $wgResourceLoaderMaxage['versioned']['server']; } which defaults to 5 minutes for unversioned modules and 30 days for versioned modules. My problem is that we have a shared server and no Squid caching, so I think that we do want versioning so that we can get the normal 30 day maxage. Can anyone give me advice? Maybe MediaWiki should contain an optional variable $wgVersionedModules = true; so that the line above can read: if ( $group === 'user' || $wgVersionedModules === true) { Thanks for any feedback, Eli