Anatomy of a responsive page load, WhiskyWeb 2013

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PAGE LOAD Andy Hume THE ANATOMY OF A WhiskyWeb II, 2013 RESPONSIVE Friday, 12 April 13

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http://www.flickr.com/photos/freefoto/2231356418/ Performance Friday, 12 April 13

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WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Friday, 12 April 13

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WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Friday, 12 April 13

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WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Friday, 12 April 13

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WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Friday, 12 April 13

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WHY CARE? http://www.strangeloopnetworks.com/resources/infographics/web-performance-and-ecommerce/ Friday, 12 April 13

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WHY CARE? Speed Profit http://goo.gl/JNRPt Friday, 12 April 13

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WHY CARE? Speed Profit http://goo.gl/JNRPt Speed high search ranking http://goo.gl/XhVfk Friday, 12 April 13

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http://www.flickr.com/photos/teosaurio/7509743298/ Lazy Friday, 12 April 13

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http://www.flickr.com/photos/teosaurio/7509743298/ The web has bitten us Friday, 12 April 13

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page load time PERFORMANCE bandwidth battery life server capacity fast interface reliability Friday, 12 April 13

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page load time PERFORMANCE page load time bandwidth battery life server capacity fast interface reliability Friday, 12 April 13

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RESPONSE TIME Server-side response time? End-user response time? Time to last byte? ALWAYS DEFINE IT Friday, 12 April 13

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TIME TO FIRST BYTE Request to start of response Normally HTML Nothing displayed yet Includes network latency Includes server-side Friday, 12 April 13

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START RENDER Content begins to display Doesn’t mean it’s useful content Things can still block afterwards Friday, 12 April 13

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LOAD TIME Full page loaded Scripts, images, etc... Site might be usable before this Friday, 12 April 13

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RANGE OF METRICS Time to first byte Start render time Load time KNOW WHICH ONE Friday, 12 April 13

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http://webpagetest.org webpagetest.org Friday, 12 April 13

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WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG iPhone 4 / iOS 5.1 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG iPhone 4 / iOS 5.1 3G (2/1 Mbps, 150ms RTT) 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG iPhone 4 / iOS 5.1 3G (2/1 Mbps, 150ms RTT) Dulles, Virginia 0.1930 Friday, 12 April 13

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WEBPAGETEST.ORG Friday, 12 April 13

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WEBPAGETEST.ORG Friday, 12 April 13

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WEBPAGETEST.ORG Friday, 12 April 13

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WEBPAGETEST.ORG Friday, 12 April 13

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WEBPAGETEST.ORG Friday, 12 April 13

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Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

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Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

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Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

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Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

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Content Enhancement Leftovers Friday, 12 April 13

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Content Enhancement Leftovers Friday, 12 April 13

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Content Enhancement Leftovers Friday, 12 April 13

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Content Enhancement Leftovers Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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LOADING CSS Compressed Long cache time One file Content-Encoding: gzip Cache-Control: max-age=315360000 Friday, 12 April 13

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LOADING CSS

Content goes here

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Content goes here

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Content goes here

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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LOADING JAVASCRIPT Compressed Long cache time One file Content-Encoding: gzip Cache-Control: max-age=315360000 Friday, 12 April 13

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JAVASCRIPT

Content goes here

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JAVASCRIPT

Content goes here

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JAVASCRIPT LOADING var s = document.createElement('script'); s.src = "app.js"; document.head.appendChild(s); Friday, 12 April 13

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@if(isModernBrowser) { } CUTTING THE MUSTARD http://blog.responsivenews.co.uk/post/18948466399/cutting-the-mustard/ Cutting the Mustard Friday, 12 April 13

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if (isModernBrowser()) { var s = document.createElement('script'); s.src = "app.js"; document.head.appendChild(s); } JAVASCRIPT LOADING Friday, 12 April 13

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JAVASCRIPT LOADING var isModernBrowser = function() { return ( ‘querySelector’ in document && ‘addEventListener’ in window && ‘localStorage’ in window ); }; Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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IMAGES: SPRITES Friday, 12 April 13

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IMAGES: SVG Friday, 12 April 13

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IMAGES: ASSET FONTS @2x @?x Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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http://www.flickr.com/photos/spacemanbob/1084139169/ Web fonts Friday, 12 April 13

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FONT LOADING Progressive enhancement Friday, 12 April 13

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FONT LOADING Progressive enhancement Cuts the mustard Friday, 12 April 13

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FONT LOADING Progressive enhancement Cuts the mustard Supports WOFF Friday, 12 April 13

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FONT LOADING Progressive enhancement Cuts the mustard Supports WOFF localStorage available Friday, 12 April 13

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PRE-RENDER CUT THE MUSTARD? NO FONTS SHOW FONTS NO NO SUPPORT WOFF? FONTS IN STORAGE? NO Friday, 12 April 13

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POST-RENDER STORAGE AVAILABLE? NO FONTS SHOW FONTS NO DOWNLOAD FONTS: BASE64 ENCODED IN JSON CACHE FONTS IN STORAGE Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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IMAGES: NEW SPECS Describes the image.

srcset attribute Friday, 12 April 13

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IMAGES: NEW SPECS Picture element Friday, 12 April 13

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IMAGES: ON DEMAND Friday, 12 April 13

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IMAGES: ON DEMAND Friday, 12 April 13

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IMAGES: ON DEMAND Friday, 12 April 13

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IMAGES: ON DEMAND

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IMAGES: APPROPRIATE https://speakerdeck.com/paulrobertlloyd/the-edge-of-the-web-redux Friday, 12 April 13

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Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April 13

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Thank-you! http://lanyrd.com/cmhcd @andyhume Creative Commons Licensed Attribution, Non-Commercial, Share Alike cc Friday, 12 April 13