On Tue, Dec 3, 2013 at 10:02 PM, Roan Kattouw <roan.kattouw(a)gmail.com>wrote;wrote:
* The drop occurred because ResourceLoaderLanguageDataModule had a bug
in its mtime computation, causing it to recache all the time; module
storage greatly dampened the impact of that bug.
This is true, and it was a confounding factor in the analysis. So our
initial results were bupkes.
Aaron and I decided to repeat the experiment, so we re-ran it for a ten-day
period between January 6th and January 16th. The results are more modest
but still significant: module storage reduces load time overall by about
100ms. This effect is consistent between mobile and desktop.
http://meta.wikimedia.org/wiki/File:Module_storage.experiment_2.load_time.g…
It is now re-enabled across Wikimedia wikis.