On Monday, April 25, 2016, Ori Livneh <[email protected]> wrote: > Not so straight-forward. Khan Academy tried unbundling JavaScript on HTTP/2 > page views last November and found that performance got worse. They > attribute the regression primarily to the fact that bundling improves > compression. They concluded that "it is premature to give up on bundling > JavaScript files at this time, even for HTTP/2.0 clients." > > (http://engineering.khanacademy.org/posts/js-packaging-http2.htm)
Nice, I'll go read that. :) > On most browsers, we take advantage of localStorage pretty heavily in order > to have a durable cache of individual modules. Without it, slight > variations in the module requirements would occasion re-downloading a lot > of JavaScript, as the browser had no way of reusing JavaScript and CSS > delivered under a different URL. (Service Workers now provide more > sophisticated means of doing that, but global browser support is still only > at 53%. > > We had to disable localStorage caching in Firefox because of the way it > manages quotas. Is your primary mobile browser Firefox for Android / iOS? Service workers are sounding more and more attractive here -- we could rewrite the requests as necessary to bundle when it makes sense etc, and avoid clogging up the synchronous, space-limited localStorage. Needs more research... > Lastly, we have good evidence that above-the-fold external CSS is a bigger > contributor to page latency than JavaScript. Gabriel documented that pretty > well in T124966 <https://phabricator.wikimedia.org/T124966>. That CSS is a > bigger issue than JavaScript is not surprising (top-loaded CSS is > render-blocking, whereas all of our JavaScript is loaded asynchronously), > but the magnitude of its impact is impressive. > > Krinkle is working on an arc of tasks that would get us there; T127328 > <https://phabricator.wikimedia.org/T127328> is the master task. Awesome, I'll read up and comment! -- brion > _______________________________________________ > Wikitech-l mailing list > [email protected] <javascript:;> > https://lists.wikimedia.org/mailman/listinfo/wikitech-l _______________________________________________ Wikitech-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikitech-l
