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Anatomy of a responsive page load, WhiskyWeb 2013

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April 12, 2013
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Anatomy of a responsive page load, WhiskyWeb 2013

Longer version of performance talk for WhiskyWeb II in Edinburgh.

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Andy Hume

April 12, 2013
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Transcript

  1. PAGE LOAD Andy Hume THE ANATOMY OF A WhiskyWeb II,

    2013 RESPONSIVE Friday, 12 April 13

  2. Text Friday, 12 April 13

  3. Friday, 12 April 13

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

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

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

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

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

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

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

  11. WHY CARE? Speed Profit http://goo.gl/JNRPt Speed high search ranking http://goo.gl/XhVfk

    Friday, 12 April 13

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

  13. Friday, 12 April 13

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

  15. page load time PERFORMANCE bandwidth battery life server capacity fast

    interface reliability Friday, 12 April 13

  16. page load time PERFORMANCE page load time bandwidth battery life

    server capacity fast interface reliability Friday, 12 April 13

  17. RESPONSE TIME Server-side response time? End-user response time? Time to

    last byte? ALWAYS DEFINE IT Friday, 12 April 13

  18. TIME TO FIRST BYTE Request to start of response Normally

    HTML Nothing displayed yet Includes network latency Includes server-side Friday, 12 April 13

  19. START RENDER Content begins to display Doesn’t mean it’s useful

    content Things can still block afterwards Friday, 12 April 13

  20. LOAD TIME Full page loaded Scripts, images, etc... Site might

    be usable before this Friday, 12 April 13

  21. RANGE OF METRICS Time to first byte Start render time

    Load time KNOW WHICH ONE Friday, 12 April 13

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

  23. WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

  24. WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

  25. WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

  26. WEBPAGETEST.ORG 0.1930 Friday, 12 April 13

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

    13

  28. WEBPAGETEST.ORG iPhone 4 / iOS 5.1 3G (2/1 Mbps, 150ms

    RTT) 0.1930 Friday, 12 April 13

  29. WEBPAGETEST.ORG iPhone 4 / iOS 5.1 3G (2/1 Mbps, 150ms

    RTT) Dulles, Virginia 0.1930 Friday, 12 April 13

  30. WEBPAGETEST.ORG Friday, 12 April 13

  31. WEBPAGETEST.ORG Friday, 12 April 13

  32. WEBPAGETEST.ORG Friday, 12 April 13

  33. WEBPAGETEST.ORG Friday, 12 April 13

  34. WEBPAGETEST.ORG Friday, 12 April 13

  35. Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

  36. Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

  37. Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

  38. Content THREE LEVELS Enhancement Leftovers Friday, 12 April 13

  39. Content Enhancement Leftovers Friday, 12 April 13

  40. Content Enhancement Leftovers Friday, 12 April 13

  41. Content Enhancement Leftovers Friday, 12 April 13

  42. Content Enhancement Leftovers Friday, 12 April 13

  43. Content Enhancement Leftovers DOMContentReady event Friday, 12 April 13

  44. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  45. Content Enhancement Leftovers DOMContentReady event Friday, 12 April 13

  46. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  47. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  48. LOADING CSS Compressed Long cache time One file Content-Encoding: gzip

    Cache-Control: max-age=315360000 Friday, 12 April 13

  49. LOADING CSS <html> <head> <link href="main.css" rel="stylesheet" /> </head> </body>

    <p>Content goes here</p> </body> </html> Friday, 12 April 13

  50. <html> <head> <link href="small.css" rel="stylesheet" /> <!-- For larger viewports

    --> <link href="larger.css" media="screen and (min-width: 640px)" rel="stylesheet" /> </head> </body> <p>Content goes here</p> </body> </html> NETWORK LOADING CSS Friday, 12 April 13

  51. <html> <head> <link href="main.css" rel="stylesheet" /> <!-- For gallery pages

    --> <link href="gallery.css" rel="stylesheet" /> </head> </body> <p>Content goes here</p> </body> </html> NETWORK LOADING CSS Friday, 12 April 13

  52. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  53. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  54. LOADING JAVASCRIPT Compressed Long cache time One file Content-Encoding: gzip

    Cache-Control: max-age=315360000 Friday, 12 April 13

  55. JAVASCRIPT <html> <head> <link href="main.css" rel="stylesheet" /> <!-- For larger

    viewports --> <link href="larger.css" media="screen and min-width: 640px)" rel="stylesheet" /> <script src="app.js"></script> </head> </body> <p>Content goes here</p> </body> </html> NETWORK NET Friday, 12 April 13

  56. JAVASCRIPT <html> <head> <link href="main.css" rel="stylesheet" /> <!-- For larger

    viewports --> <link href="larger.css" media="screen and min-width: 640px)" rel="stylesheet" /> </head> </body> <p>Content goes here</p> <script src="app.js"></script> </body> </html> NETWORK NET Friday, 12 April 13

  57. JAVASCRIPT LOADING <script> var s = document.createElement('script'); s.src = "app.js";

    document.head.appendChild(s); </script> Friday, 12 April 13

  58. @if(isModernBrowser) { <script src="app.js" async defer></script> } CUTTING THE MUSTARD

    http://blog.responsivenews.co.uk/post/18948466399/cutting-the-mustard/ Cutting the Mustard Friday, 12 April 13

  59. <script> if (isModernBrowser()) { var s = document.createElement('script'); s.src =

    "app.js"; document.head.appendChild(s); } </script> JAVASCRIPT LOADING Friday, 12 April 13

  60. JAVASCRIPT LOADING var isModernBrowser = function() { return ( ‘querySelector’

    in document && ‘addEventListener’ in window && ‘localStorage’ in window ); }; Friday, 12 April 13

  61. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  62. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  63. IMAGES: SPRITES Friday, 12 April 13

  64. IMAGES: SVG Friday, 12 April 13

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

  66. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  67. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

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

  69. FONT LOADING Progressive enhancement Friday, 12 April 13

  70. FONT LOADING Progressive enhancement Cuts the mustard Friday, 12 April

    13

  71. FONT LOADING Progressive enhancement Cuts the mustard Supports WOFF Friday,

    12 April 13

  72. FONT LOADING Progressive enhancement Cuts the mustard Supports WOFF localStorage

    available Friday, 12 April 13

  73. PRE-RENDER CUT THE MUSTARD? NO FONTS SHOW FONTS NO NO

    SUPPORT WOFF? FONTS IN STORAGE? NO Friday, 12 April 13

  74. POST-RENDER STORAGE AVAILABLE? NO FONTS SHOW FONTS NO DOWNLOAD FONTS:

    BASE64 ENCODED IN JSON CACHE FONTS IN STORAGE Friday, 12 April 13

  75. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  76. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  77. Friday, 12 April 13

  78. IMAGES: NEW SPECS <img alt="Describes the image." src="medium.jpg" srcset="small.jpg 640w,

    small-hd.jpg 640w 2x, med-hd.jpg 2x" /> srcset attribute Friday, 12 April 13

  79. IMAGES: NEW SPECS <picture alt="Describes the image."> <source src="s.jpg"> <source

    media="(min-width:320px)" src="m.jpg"> </picture> Picture element Friday, 12 April 13

  80. IMAGES: ON DEMAND Friday, 12 April 13

  81. IMAGES: ON DEMAND Friday, 12 April 13

  82. IMAGES: ON DEMAND Friday, 12 April 13

  83. IMAGES: ON DEMAND <div data-alt="Describes the image." data-src="small.jpg" data-src-high="large.jpg" data-width="180"

    data-height="100" > </div> Friday, 12 April 13

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

  85. Content Enhancement Leftovers DOMContentReady event Load event Friday, 12 April

    13

  86. Thank-you! http://lanyrd.com/cmhcd @andyhume Creative Commons Licensed Attribution, Non-Commercial, Share Alike

    cc Friday, 12 April 13