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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. Mike Sherov (he/him)  🚀‏ @mikesherov 2 Aug 2019
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      Replying to @FredKSchott @slightlylate

      Oh wait! You're using "defer"... don't do that! You only want <script async> for GA. defer explicitly tells it to only execute after page has parsed.

      2 replies 0 retweets 2 likes
    2. Andy Davies‏ @AndyDavies 2 Aug 2019
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      Replying to @mikesherov @FredKSchott @slightlylate

      From memory async will override defer if both are specified (but check spec to be sure) Isn’t async vs defer for GA a matter of how comfortable someone is with the data loss from loading it later vs the impact it has on pushing other JS execution back?

      1 reply 0 retweets 0 likes
    3. Mike Sherov (he/him)  🚀‏ @mikesherov 2 Aug 2019
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      Replying to @AndyDavies @FredKSchott @slightlylate

      Let's see how the change effects the waterfall :-)

      1 reply 0 retweets 0 likes
    4. fks‏ @FredKSchott 2 Aug 2019
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      Replying to @mikesherov @AndyDavies @slightlylate

      fks Retweeted fks

      responded here:https://twitter.com/FredKSchott/status/1157388801515200512 …

      fks added,

      fks @FredKSchott
      Replying to @FredKSchott @mikesherov @slightlylate
      okay made the change and retested, but results aren't too different: https://www.webpagetest.org/result/190802_SD_d1b7efa3c6bc8340d73bcf33fbde623a/1/details/#waterfall_view_step1 … My new guess is that modulepreload isn't actually loading transitive deps, and that they only load once the client-side router executes and triggers a full import.
      1 reply 0 retweets 1 like
    5. Andy Davies‏ @AndyDavies 2 Aug 2019
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      Replying to @FredKSchott @mikesherov @slightlylate

      So I'd add <link rel=preconnect to the GTM and GA origins. Chrome is scheduling them at lowest priority and it doesn't connect eagerly, preconnect should move it forward I'd also self host fontawesome, and consider loading Google Fonts async if you cope with the font reflow

      2 replies 1 retweet 4 likes
    6. Mike Sherov (he/him)  🚀‏ @mikesherov 2 Aug 2019
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      Replying to @AndyDavies @FredKSchott @slightlylate

      I'd preload GA, not just preconnect

      1 reply 0 retweets 0 likes
    7. Andy Davies‏ @AndyDavies 2 Aug 2019
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      Replying to @mikesherov @FredKSchott @slightlylate

      But why? Preloading GA means everything else gets a lower priority (particularly on poor connections) Surely the site content is more important than the analytics?

      1 reply 0 retweets 0 likes
    8. Mike Sherov (he/him)  🚀‏ @mikesherov 2 Aug 2019
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      Replying to @AndyDavies @FredKSchott @slightlylate

      Having GA run earlier while other content is being downloaded means it's not contended with other JS that is trying to run after DomContentLoaded.

      1 reply 0 retweets 0 likes
    9. Alex Russell‏ @slightlylate 2 Aug 2019
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      Replying to @mikesherov @AndyDavies @FredKSchott

      Sorry for the slow reply. Here's the 3G trace on the same hardware: https://www.webpagetest.org/result/190802_7Q_3a7b3a5321251394011376ae4f1798be/ … I have some questions!

      1 reply 0 retweets 0 likes
    10. Alex Russell‏ @slightlylate 2 Aug 2019
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      Replying to @slightlylate @mikesherov and

      Looking at the filmstrip, it seems that the big ticket item is the search result: https://www.webpagetest.org/video/compare.php?tests=190802_7Q_3a7b3a5321251394011376ae4f1798be-r:1-c:0 …

      1 reply 0 retweets 0 likes
      Alex Russell‏ @slightlylate 2 Aug 2019
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      Replying to @slightlylate @mikesherov and

      It *looks* as though that isn't getting fetched until `fetch.js` comes in, which doesn't seem to get requested until relatively late. On the analytics stuff, honestly, I'd move that *below* the critical content.

      4:18 PM - 2 Aug 2019
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        2. fks‏ @FredKSchott 2 Aug 2019
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          Replying to @slightlylate @mikesherov @AndyDavies

          that fetch is fired off by code inside of SearchPage.js, so it's waiting for all of it's imports to load (of which fetch.js is one of them) you can see the file's ~8 imports here: https://next.pika.dev/static/js/pages/SearchPage.js …

          1 reply 0 retweets 1 like
        3. Alex Russell‏ @slightlylate 2 Aug 2019
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          Replying to @FredKSchott @mikesherov @AndyDavies

          Yeah, was just digging into that. On a super slow link, you could get some mileage by pushing those deps (PRPL style) or <link rel="preload"> them if you know you'll need 'em for a given UA.

          1 reply 0 retweets 1 like
        4. 6 more replies
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        2. Alex Russell‏ @slightlylate 2 Aug 2019
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          Replying to @slightlylate @mikesherov and

          ...otherwise, on a slow link like this, you're spending a lot of your bandwidth in the critical moments on connection setup on stuff that doesn't actually improve the user experience.

          2 replies 0 retweets 0 likes
        3. Alex Russell‏ @slightlylate 2 Aug 2019
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          Replying to @slightlylate @mikesherov and

          The spinner element seems to get blocked by lots of stuff, even though it's definition is inlined. Naively I'd expect that to be painting at the ~2s mark, rather than 4.3s as I see here: https://www.webpagetest.org/video/compare.php?tests=190802_7Q_3a7b3a5321251394011376ae4f1798be-r%3A1-c%3A0&thumbSize=200&ival=100&end=full …

          1 reply 0 retweets 1 like
        4. 10 more replies

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