Thanks, Gergo, that is really useful information. I didn’t realize that opening the lightbox can takes so long, with the actual image load itself being only a fraction of that total load time.
If there’s a better way to load the thumbnails than we are now, I’m in favor of experimenting with it, to see if it solves the issue. Of course, with all the trade-offs we face, fixing one issue can introduce new ones, so we want to be careful to move methodically on this … :) Much appreciated, Fabrice On Apr 21, 2014, at 11:29 AM, Gergo Tisza <[email protected]> wrote: > > I did some tests on https://www.mediawiki.org/wiki/Lightbox_demo over a > slowish mobile connection (1 Mbps downlink). Opening a lightbox takes over > 30s with a warm JS cache when you do it immediately on page load (via an URL > hashtag). The actual image load takes about 4s; the rest of the time is taken > up by all the image thumbnails on the page loading. Since MediaViewer's > bootstrap script runs on DOM ready, every single image on the page is queued > to load before it; these are small ~200px thumbnails which take a few hundred > milliseconds to load, but there are several dozens of them and they add up. > > This is probably not what causes most delays, but it can cause delays for > specific conditions (there are lots of thumbnails on the page, the user's > browser did not cache them yet, and they use an URL hash or click on a > thumbnail soon after the page loaded) which are not unplausible (e.g. a > MediaViewer URL to an image on a gallery or category page is being shared on > twitter). Unfortunately, I have no idea what to do with this one - the issue > is not with anything MediaViewer does, and there is no way to influence the > order in which the browser loads the images (we could try horrible hacks like > loading the image in AJAX, but at best they would help on some browsers > only). We could add more logic to the head script to start image preloading > immediately, but eww. I suspect we will need a UI solution for this one, > which tells the user to expect waiting for a while. > _______________________________________________ > Multimedia mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/multimedia _______________________________ Fabrice Florin Product Manager Wikimedia Foundation http://en.wikipedia.org/wiki/User:Fabrice_Florin_(WMF)
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