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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. Tom Dale‏ @tomdale 13 Sep 2018
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      Replying to @tomdale @slightlylate @wycats

      I believe @chadhietala has the WPT traces if you'd like to see them.

      2 replies 0 retweets 1 like
    2. Kristofer Baxter‏ @kristoferbaxter 13 Sep 2018
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      Replying to @tomdale @slightlylate and

      Don’t want to be involved here but feel compelled to respond. Data helps toward the end goal of a great experience for users of many applications. I’ll assume variables are equally accounted for in cells and look at the results, can you provide the raw data to support claims?

      2 replies 0 retweets 0 likes
    3. Tom Dale‏ @tomdale 13 Sep 2018
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      Replying to @kristoferbaxter @slightlylate and

      Take Glimmer out so I don't have a horse in the race and just look at Preact. Preact is much lighter than Polymer out of the box, and for the experiment our JS bundle size was tiny (much much smaller than e.g. YouTube Gaming). Even in that scenario, SSR had better FMP at 90p.

      1 reply 0 retweets 1 like
    4. Tom Dale‏ @tomdale 13 Sep 2018
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      Replying to @tomdale @kristoferbaxter and

      All I'm trying to say is that Preact is a much better fit for pages at the extreme end of performance, because it's both lighter than Polymer and gives you the option of SSR if you need it.

      1 reply 1 retweet 1 like
    5. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @tomdale @kristoferbaxter and

      @chadhietala posted traces in the comments: https://infrequently.org/2018/09/the-developer-experience-bait-and-switch/#comment-256438 … Here are the preact-only sets of runs: CSR: http://www.webpagetest.org/result/180202_67_ae21f1a34a7f570599edae125e1c292a/ … SSR+CSR: http://www.webpagetest.org/result/180202_VF_84ae556dc7c51e405d5fccccccb383ae/ …

      1 reply 0 retweets 0 likes
    6. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      As noted in the comments of the post,there's a lot of noise between runs. The user-timeline data seems to vary in access cost, which I presume affects both equally? Hard to know.

      2 replies 0 retweets 0 likes
    7. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      It looks like the SSR version gets ~complete 500ms sooner. This is interesting given the waterfall for the CSR version: http://www.webpagetest.org/result/180202_67_ae21f1a34a7f570599edae125e1c292a/3/details/ … Request for data is delayed by ~300ms because it's blocked by script eval? Why?

      1 reply 0 retweets 1 like
    8. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      I'd have thought critical data would be H/2 pushed or at least `<link rel="preload">`-ed to get the parser working for you and prevent device speed from being a factor in getting that request out to the network.

      1 reply 0 retweets 1 like
    9. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      Also, can we just stop and note how weird it is that we're talking about a low-latency network and desktop CPU in 2018? That choice surely needs exposition. One of the reasons I'd have thought SSR would be a win is that it largely removes client CPU from the equation.

      1 reply 0 retweets 1 like
    10. Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      ...so these traces under-sell the impact of JS size and latency on the experience. Both would factors improve with SSR. Was a cable connection chosen because most LI customers have *faster* networks than that?

      1 reply 0 retweets 1 like
      Alex Russell‏ @slightlylate 13 Sep 2018
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      Replying to @slightlylate @tomdale and

      Anyhow, back to the data: What I care about (primarily) is interactivity, as defined by having meaningful content that will be responsive to input (i.e., the main thread isn't locked up). Both traces spend most of their main-thread time on...layout? Huh.

      9:02 AM - 13 Sep 2018
      1 reply 0 retweets 0 likes
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        2. Alex Russell‏ @slightlylate 13 Sep 2018
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          Replying to @slightlylate @tomdale and

          What I get from this is that these test largely measure the effect of loading JS in parallel to data rather than serial: http://www.webpagetest.org/video/compare.php?tests=180202_67_ae21f1a34a7f570599edae125e1c292a-r%3A3-c%3A0%2C180202_VF_84ae556dc7c51e405d5fccccccb383ae-r%3A1-c%3A0&thumbSize=200&ival=100&end=full …pic.twitter.com/MxMNvM4E1L

          1 reply 0 retweets 1 like
        3. Alex Russell‏ @slightlylate 13 Sep 2018
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          Replying to @slightlylate @tomdale and

          These are also wholly different to most of what I observe in "SSR" traces on more representative devices and networks. This isn't showing the huge script payload camping out on the main thread seconds after content arrives. In short, it's good work all around.

          1 reply 0 retweets 0 likes
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