Interesting to see the drop in bytes sent to the Japan article and this
makes me think we should "fold up" article sections on desktop too for very
long articles, such as the Japan article. The benefits for mobile are
obvious, but this may be beneficial for slow desktop connections as well.

---------- Forwarded message ----------
From: Jon Robson <>
Date: Tue, Aug 23, 2016 at 5:20 PM
Subject: [WikimediaMobile] Mobile site is now lazy loading images
To: mobile-l <>, Wikimedia developers <>

FYI after much experimentation, research and testing the mobile site has
been lazy loading images [1] since Thursday 18th August. This means if you
do not see an image you will not download it. We have taken care to ensure
users without JavaScript can still view images and that most users will
barely notice the difference.

We are currently crunching the data this change has made and we plan to
write a blog post to reporting the results.

In our experiments on Japanese Wikipedia we saw a drop in image bytes per
page view by 54% On the Japanese Japan article bytes shipped to users
dropped from 1.443 MB to 142 kB.

This is pretty huge since bytes equate to money [3] and we expect this to
be significant on wikis where mobile data is more expensive. In a nutshell
Wikipedia mobile is cheaper.

As I said blog post to follow once we have more information, but please
report any bugs you are seeing with the implementation (we have already
found a few thanks to our community of editors).



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