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slightlylate's profile
Alex Russell
Alex Russell
Alex Russell
@slightlylate

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Alex Russell

@slightlylate

Chrome Project 🐡 & Web Standards TL; Blink API OWNER Named PWAs w/ @phae; probably making her ☕ DMs open. Tweets my own; press@google.com for official comms.

San Francisco, The Internet
infrequently.org
Joined December 2010

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    1. Alex Russell‏ @slightlylate 9 Aug 2018
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      Getting more information to construct a more accurate dependency graph would require more processing (and waiting) on the client side before issuing requests...which is dead air...which is bad. So client's don't actually wait. They take their initial guess about priority and run.

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    2. Alex Russell‏ @slightlylate 9 Aug 2018
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      "But", I hear you saying, "the client can adjust priorities!": https://http2.github.io/http2-spec/#reprioritize … LAWLZ.

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    3. Alex Russell‏ @slightlylate 9 Aug 2018
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      In practice, inbound requests dish off to some other thread. That work is likely I/O bound. That I/O, once started, isn't worth pausing or changing. You're better off getting the bytes into memory to be flushed ASAP with as little second guessing as possible.

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    4. Alex Russell‏ @slightlylate 9 Aug 2018
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      High-performance H/2 servers will pretty much always drop subsequent PRIORITY frames on the floor and high-performance clients won't wait to generate them. H/2 priorities are a practical joke as far as I can tell. I presume @mnot is getting the last laugh.

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    5. Alex Russell‏ @slightlylate 9 Aug 2018
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      So what's happening in @EWErikWitt's post is a cruel combination: 1.) HTML has serially failed to define a meaningful priority scheme (yes, I'm grumpy about it) 2.) H/2 priorities aren't passed because it's "magic" info as a result 3.) fetch() is in the XHR slow bucket 😥

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    6. Alex Russell‏ @slightlylate 9 Aug 2018
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      's post should be titled "Service Workers show how broken HTML and H/2 priorities are". We can do some magic in the limited case he outlines where the source `Request` hasn't been touched, but honestly, we shouldn't.

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    7. Alex Russell‏ @slightlylate 9 Aug 2018
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      Instead, we should be exposing a real, integer-range-based, priority system. No, browsers won't magically agree on these weights. Yes, network stack will sometimes need to reorder anyway, but how is that worse than the status quo?

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    8. Alex Russell‏ @slightlylate 9 Aug 2018
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      The infuriating part of this is the condescension from the H/2 and network stack community. The fear that web developers will "just make everything high priority; then what?" is both real, true, and useless.

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    9. Alex Russell‏ @slightlylate 9 Aug 2018
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      We'll always need to intervene as the user's agent, but so long as JS is part of the platform, developers could *already* do whatevs; it might just have been the long way 'round.

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    10. Alex Russell‏ @slightlylate 9 Aug 2018
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      So it's worth flagging this effect, worth being upset, and perhaps even worth calling out all the folks who work on Chrome that haven't fixed it. But the problem isn't the implementation. It's harder and worse than that. It's a fundamental lack of respect for web developers.

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      Alex Russell‏ @slightlylate 10 Aug 2018
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      Taking control of the network shouldn't mean always getting down-ranked in priority. This sort of magic needs to be in developer hands: https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/loader/fetch/resource_fetcher.cc?l=124 …

      12:31 AM - 10 Aug 2018
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      • Eddie Kohler Matthew Holloway ☄ Dominic Farolino Fred Stark Ville Lahdenvuo Yoav Weiss
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