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 > <javascript:_e(%7B%7D,'cvml','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 >> <javascript:_e(%7B%7D,'cvml','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/Performa >>> nce/Lazy_loading_images >>> [2] https://www.mediawiki.org/wiki/Reading/Web/Lazy_loading_ >>> of_images_on_Japanese_Wikipedia >>> [3] https://whatdoesmysitecost.com/ >>> >>> >>> >>> _______________________________________________ >>> Mobile-l mailing list >>> Mobile-l@lists.wikimedia.org >>> <javascript:_e(%7B%7D,'cvml','Mobile-l@lists.wikimedia.org');> >>> https://lists.wikimedia.org/mailman/listinfo/mobile-l >>> >>> >> >> _______________________________________________ >> Mobile-l mailing list >> Mobile-l@lists.wikimedia.org >> <javascript:_e(%7B%7D,'cvml','Mobile-l@lists.wikimedia.org');> >> https://lists.wikimedia.org/mailman/listinfo/mobile-l >> >> >
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