Huge congratulations to the team! I can't wait to see the data and blogpost
on this. A cheaper Wikipedia mobile will go a long way to help us address
the data affordability barrier, attract new Wikipedia Zero partners and
bring in new readers.

On Fri, Aug 26, 2016 at 9:47 AM, Jane Darnell <> wrote:

> 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).
> ~Jon
> [1]
> Performance/Lazy_loading_images
> [2]
> of_images_on_Japanese_Wikipedia
> [3]
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