Improving Media Content Performance with Service Workers #BuzzJS

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1 Service Workers & Media: for the rest of your users @ColinBendell CTO Office, Cloudinary

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JS PREACHER CHRISTIAN NWAMBA PROGRAM MANAGER / WRITER SCOTCH.IO DEV ADVOCATE / MARKETING CLOUDINARY ORGANIZER ANGULAR NIGERIA ORGANIZER FORLOOP AFRICA @codebeast AUTHOR

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Page Load Time: Seconds

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2012: 3,977 Different Android Devices Source: OpenSignal 2012: 3,977 Different Android Devices

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Source: OpenSignal 2015: 24.0k Different Android Devices

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“…25% of new Android phones have only 512MB of RAM.” Jen Fitzpatrick VP of product management for Google Maps

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@codebeast @colinbendell

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2 Second Magic Number Page Load Time: Seconds

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Next Billion Users @codebeast @colinbendell

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Next Billion Users @codebeast @colinbendell Including the baby

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Common Strategies • USSD / SMS • Accessibility • Research • Service Workers & PWA • Empathy @codebeast @colinbendell

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Service Workers and PWA

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@codebeast @colinbendell

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SW Basics • Persistent across page loads • Intercept Request & Response • Offline & Enhanced caching • Manifest: home icon, splash screen, standalone app @codebeast @colinbendell

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if (navigator.serviceWorker) { navigator.serviceWorker.register('/serviceworker.js'); }

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Source: Google Dev

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L1: 0.0005μs L2: 0.007μs L2: 0.030μs RAM: 0.1 μs SSD: 0.15 ms Seek: 10 ms Wifi: 25ms LTE: 75ms 3G: 150ms 1 bit of data accessed from CPU, Memory, Disk, Network Caching is Everywhere (200x L1) (20,000,000x L1) (300,000,000x L1) (1,000,000,000x L1) (10,000,000,000x L1)

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• Image optimization • Progressive image delivery (use Intersection Observer) • Use bundle splitting • Deferred fetching with lazy loading • Prefetching • Take advantage of cache and web storage • Pretty much every other thing to make your web app fast and deliver better user experience

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if (navigator.serviceWorker) { navigator.serviceWorker.register('/serviceworker.js'); }

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addEventListener( 'fetch', ( fetchEvent ) => { } );

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addEventListener( 'fetch', ( fetchEvent ) => { if ( fetchEvent.request.destination !== 'image' ) { // console.log('not an image request'); return; } } );

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addEventListener( 'fetch', ( fetchEvent ) => { if ( fetchEvent.request.destination !== 'image' ) { // console.log('not an image request'); return; } const url = fetchEvent.request.url; fetchEvent.respondWith( fetch(url); ); } );

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if ( // Save-Data is on fetchEvent.request.headers.get( 'save-data' ) // bandwidth or RTT is slower than a typical 3G connect || (navigator.connection.effectiveType.match( /2g/ ) ) // we have less than ~1GB of RAM || (navigator.deviceMemory < 1 ) ) {

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Resize Demo https://codepen.io/eeeps/project/live/ZLGOyN/

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Progressive Img Demo https://codepen.io/eeeps/pen/wjmyOz

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Progressive Image Demo2 https://codepen.io/eeeps/pen/ZdGzya

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44 Does this feel weird?

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Source: Auth0 Flipkart 3x less data usage 40% higher re-engagement 70% conversion rate @codebeast @colinbendell

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Source: Auth0 Housing.com 40% lower bounce rate 30% faster page load 10% longer avg session @codebeast @colinbendell

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@codebeast @colinbendell

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Summary • We are technologists, you are not the typical user • Use Service Workers to adapt the User Experience • Offline Caching • Reduce pixel dimensions in fragile Networks

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@ColinBendell