This is so rad, congratulations! I know this has been years in the making -
it's really awesome to see it working :D

On Tue, Aug 23, 2016 at 5:11 PM Adam Baso <ab...@wikimedia.org> wrote:

> Good question - the code tries to fetch the images ahead of them coming
> into the viewport. That can mean upon section expansion, as well.
>
> On Tuesday, August 23, 2016, Justin Ormont <justin.orm...@gmail.com>
> wrote:
>
>> This sounds great. Are the images pre-loaded when the user gets close, or
>> once it's scrolled into view?
>>
>> --justin
>>
>> On Tue, Aug 23, 2016 at 3:48 PM, Volker Eckl <vol...@wikimedia.org>
>> wrote:
>>
>>> Amazing work! Enjoying the further speed improvements and the detailed
>>> analysis of Japanese Wikipedia testcase.
>>>
>>> On Tue, Aug 23, 2016 at 2:20 PM, Jon Robson <jrob...@wikimedia.org>
>>> wrote:
>>>
>>>> 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]
>>>> https://www.mediawiki.org/wiki/Reading/Web/Projects/Performance/Lazy_loading_images
>>>> [2]
>>>> https://www.mediawiki.org/wiki/Reading/Web/Lazy_loading_of_images_on_Japanese_Wikipedia
>>>> [3] https://whatdoesmysitecost.com/
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>
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