Rebuilding a faster, lazier Slack

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Presented by Samantha Siow (she/her) REBUILDING A FASTER, LAZIER SLACK

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LEGACY MODERN

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Handlebars & Smarty templates Manual DOM updates via jQuery Multiple processes for multiple workspaces Eager data loading LEGACY

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5 YEARS

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5 YEARS

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All UI components built in React Single process for multiple workspaces Lazily-loaded and incomplete data model MODERN

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1. Load less code upfront 2. Declutter your boot data 3. Prioritize initial API calls

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1. Load less code upfront 2. Declutter your boot data 3. Prioritize initial API calls

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LEGACY

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700ms JS assets LEGACY

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LEGACY 1750ms

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Start initial API calls LEGACY

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1. Lots of templates! 2. Lots of code! Problems:

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MODERN

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MODERN boot payload

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700ms -> 160ms MODERN boot payload

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Dynamically import JS bundles MODERN Start initial API calls

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MODERN 800ms

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But wait! There’s more!

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MODERN (+ Service Worker!)

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MODERN 700ms -> 160ms 36.9ms! boot payload (+ Service Worker!)

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MODERN 550ms (+ Service Worker!)

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1. Client-side rendering 2. Small boot payload 3. Code splitting 4. Use SW to cache assets Solutions:

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1. Load less code upfront 2. Declutter your boot data 3. Prioritize initial API calls

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Lots of data required to boot Problem:

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https://www.onekingslane.com/live-love-home/marie-kondo-book-declutter/

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OLD NEW Eager loading / Complete Model

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OLD NEW Eager loading / Complete Model Lazy loading / Incomplete Model

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???

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???

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Embrace the unknown Solution:

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1. Load less code upfront 2. Declutter your boot data 3. Prioritize initial API calls

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5750ms LEGACY

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blocks first meaningful paint LEGACY

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LEGACY not really blocking blocks first meaningful paint

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1. API calls block boot 2. We have so many API calls Problems:

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MODERN 2500ms

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MODERN high priority

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deferred MODERN high priority

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parallel calls MODERN

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1. Prioritize 2. Parallelize Solutions: 3. The early bird get the worm API calls first meaningful paint on the screen faster

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Takeaways!

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Load less code upfront Client-side rendering Small boot payload Code splitting Use SW to cache assets

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Declutter your boot data Embrace the Unknown

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Prioritize initial API calls Prioritize Parallelize Start API calls early

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References & Credits Mark Christian & Johnny Rodgers - bit.ly/slack-rebuild When a rewrite isn’t: rebuilding Slack on the desktop Service Workers at Slack: Our Quest for Faster Boot Times and Offline Support Jim Whimpey - bit.ly/slack-sw Introducing a snappier, more efficient Slack desktop experience tiny.cc/slack-intro Slide theme: Bitter Sweet Templates for Keynote - DesiGN (https://apps.apple.com/us/app/themes-for-keynote/id935290998?mt=12) Anuj Nair - bit.ly/slack-gantry Gantry: Slack’s Fast-booting Frontend Framework Anuj Nair - bit.ly/slack-sonic Sonic: A Slack Modernization Project

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slack.engineering References & Credits Mark Christian & Johnny Rodgers - bit.ly/slack-rebuild When a rewrite isn’t: rebuilding Slack on the desktop Service Workers at Slack: Our Quest for Faster Boot Times and Offline Support Jim Whimpey - bit.ly/slack-sw Introducing a snappier, more efficient Slack desktop experience tiny.cc/slack-intro Slide theme: Bitter Sweet Templates for Keynote - DesiGN (https://apps.apple.com/us/app/themes-for-keynote/id935290998?mt=12) Anuj Nair - bit.ly/slack-gantry Gantry: Slack’s Fast-booting Frontend Framework Anuj Nair - bit.ly/slack-sonic Sonic: A Slack Modernization Project

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Thank you! samanthasiow.com [email protected]