* MW version: CDB and current PHP arrays: 757b54b, proposed PHP arrays: b481d81
* time in seconds, computed with 5 consecutive measures for each language
* computed on my laptop (Debian) on an ext4 filesystem
* tested code (in maintenance/eval.php): $lc = new LocalisationCache( $conf ); $lc->getItem( $code, 'namespaceNames' ); for each code in MediaWiki\Languages\Data\Names::$names
* variance is unbiaised sample variance (factor N-1 but not N)
* stddev is sqrt( unbiaised sample variance ), hence it is biaised
* size computed with `du -hs`
* LocalisationCache class is recreated each time else computed language is kept in memory
Code to be executed with `php maintenance/eval.php`