The roll-out of wmf15 to non-Wikipedias appears to have introduced a significant performance regression, which registered as a 1-second increase in median page load times across the cluster. The regression went away when I reverted https://gerrit.wikimedia.org/r/#/c/188409/.
Changelog: https://www.mediawiki.org/wiki/MediaWiki_1.25/wmf15