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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. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      I'm rethinking my former advice around web storage: localStorage reads are super fast since they read an in memory cache, writes are very slow. IndexedDB KV storage (like the built-in API proposal) has slow reads *and* writes and event loop delays on reads. @shubhie @_developit

      3 replies 1 retweet 22 likes
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    2. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      For an app I'm looking at when localForage is in IDB mode there's a 150ms delay on reads (and TTI) because there's so much work in the event loop. When in localStorage mode the whole app loads faster since all reads are in memory map lookups inside the renderer.

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    3. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      So then think about: https://github.com/GoogleChromeLabs/kv-storage-polyfill … I'm not sure this is the right API semantics to ship. The async iterator as ex. posts tasks for each key, so now iterating the keys might take hundreds of ms in a busy app while localStorage would take less than 1ms.

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    4. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      So I think I've convinced myself that what the web needs is setAsync() on localStorage. The read semantics are good for most apps, the write semantics are the issue. That's a minimal delta on the existing platform, is easy for folks to ship, and would make existing pages faster.

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    5. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      At the very least I think the new KV storage should consider the localStorage read and iterate semantics instead of chatting back a forth with the IDB on every method call.

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    6. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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      Scheduling work and being thoughtful about what tasks are posted to the event loop is super important for the web. Sometimes the semantics of the API impact this. I'd love to see this reviewed for every new API so we're getting the best TTI in PWAs.

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      Alex Russell‏ @slightlylate 11 Mar 2019
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      Replying to @ElliottZ

      What's the IDB delay from a worker?

      10:39 PM - 11 Mar 2019
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        2. Elliott Sprehn‏ @ElliottZ 11 Mar 2019
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          Replying to @slightlylate

          It's as slow as there is work on the event loop. If the Worker has a lot of large tasks queued up each read could be very delayed. Most apps don't need to hit disk on every read though. LocalStorage semantics of in memory cache + sync event is fine.

          1 reply 0 retweets 1 like
        3. Phil Walton‏ @philwalton 11 Mar 2019
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          Replying to @ElliottZ @slightlylate

          Yeah, in my experience most KV storage use cases require an in-memory JS object anyway (to handle private browsing mode). Which is why I hope we get IDB observers soon (at least localStorage has the `storage` event).

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