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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 20 Jun 2019
      • Report Tweet
      • Report NetzDG Violation

      The "SSR is for performance" folks need to be posting traces from mid/low-end devices/networks to demonstrate that their experiences get consistently interactive fast enough to make the magic trick actually work.

      11 replies 13 retweets 84 likes
      Show this thread
    2. Alex Russell‏ @slightlylate 20 Jun 2019
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      When I look at traces, it's 99% this:pic.twitter.com/xvtI02l0FH

      6 replies 6 retweets 40 likes
      Show this thread
    3. Alex Russell‏ @slightlylate 20 Jun 2019
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      • Report NetzDG Violation

      Getting a trace is super simple! 1.) go to: https://www.webpagetest.org/easy  2.) paste in URL 3.) select "Mobile - Regular 3G" 4.) click both checkboxes 5.) click "Start Test" 6.) share resulting URL

      3 replies 8 retweets 38 likes
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    4. Oliver Ash‏ @OliverJAsh 20 Jun 2019
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      Replying to @slightlylate

      What do you think is a good score? Here's the result for http://unsplash.com . (By sharing this I'm not implying we do this very well.) https://www.webpagetest.org/result/190620_RY_574cc1b8b8a62fca29ab24629e769129/ …

      1 reply 0 retweets 0 likes
    5. Alex Russell‏ @slightlylate 20 Jun 2019
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      Replying to @OliverJAsh

      You should be able to get to consistently interactive on first load in less than 5 seconds on that configuration (preferably 3).

      1 reply 0 retweets 1 like
    6. Alex Russell‏ @slightlylate 20 Jun 2019
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      Replying to @slightlylate @OliverJAsh

      If you look at the "main thread" chart at the bottom here, you see that it's currently at ~8 seconds: https://www.webpagetest.org/result/190620_RY_574cc1b8b8a62fca29ab24629e769129/1/details/#waterfall_view_step1 …

      2 replies 0 retweets 1 like
    7. Oliver Ash‏ @OliverJAsh 20 Jun 2019
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      Replying to @slightlylate

      Oliver Ash Retweeted Oliver Ash

      This is really not good. For context, this is a SSR'd "universal" React app, with CDN HTML caching. I've been asking the React community for solutions to this problem for awhile (the very expensive hydration), because it's not just us—but still a mystery:https://twitter.com/OliverJAsh/status/1042726866770161665 …

      Oliver Ash added,

      Oliver Ash @OliverJAsh
      On Unsplash, the first client React render pegs the CPU for several seconds on avg devices—as I'm sure is the case w/ most large React apps. Unhappy about this but solutions are unclear. This idea would go some way to fixing it. Also hoping async rendering will help? https://twitter.com/philwalton/status/1042684111691771904 …
      1 reply 0 retweets 1 like
    8. Alex Russell‏ @slightlylate 20 Jun 2019
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      Replying to @OliverJAsh

      You can get a feeling for how this would be experienced on device by clicking into the "Filmstrip View", which lets you correlate the screen updates and main-thread time with network activity: https://www.webpagetest.org/video/compare.php?tests=190620_RY_574cc1b8b8a62fca29ab24629e769129-r%3A1-c%3A0&thumbSize=200&ival=100&end=full …

      1 reply 0 retweets 1 like
      Alex Russell‏ @slightlylate 20 Jun 2019
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      Replying to @slightlylate @OliverJAsh

      what I see here is ~300KiB of JS in the critical path. The size of the JS means a lot of the time is just spent in downloading it, over and apart from the great deal of main-thread work happening.

      12:25 PM - 20 Jun 2019
      • 1 Like
      • Oliver Ash
      1 reply 0 retweets 1 like
        1. Alex Russell‏ @slightlylate 20 Jun 2019
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          Replying to @slightlylate @OliverJAsh

          Sorry for the slow follow-up; I was curious to see how this would perform if you didn't load all the heavyweight JS. Still trying to extract that from WPT...not sure why it's not working for me at the moment.

          0 replies 0 retweets 0 likes
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