Improving Performance with Responsive Images [jQueryTO]

Transcript

1. None

2. Improving Performance with Responsive Images jQueryTO March 15, 2014

3. https://github.com/nwtn/
 pres-respimg-perf-jqueryto

4. “Good performance is good design” Brad Frost

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7. bradfrostweb.com

8. “More human beings today have access to a cellphone than

   the United Nations says have access to a clean toilet.” Anand Giridharadas, New York Times, April 10 2010

9. “More human beings today have access to a cellphone than

   the United Nations says have access to a clean toilet.” Anand Giridharadas, New York Times, April 10 2010

10. bradfrostweb.com

11. bradfrostweb.com

12. 1.A flexible, grid-based layout, 2.Flexible images and media, 3.Media queries,

    a module from the CSS3 specification

13. 1.A flexible, grid-based layout, 2.Flexible images and media 3.Media queries,

    a module from the CSS3 specification

14. img { max-width: 100%; }

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17. A solution Serve one big image and let the browser

    scale it
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21. Average web page size: 1,703 KB.
 
 
 Images account

    for 1,063 KB,
 over 62% of total.
 
 HTTP Archive, March 1 2014

22. 2x resolution = 4x as many pixels

23. energy more pixels = more money time

24. “Good performance is good design” Brad Frost

25. A better solution Serve an appropriately-sized image to each user

26. Responsive Images

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31. SVG, WebP, JPEG XR

32. <picture> + srcset:
 http://picture.responsiveimages.org/ Mozilla: Q1
 Blink (Chrome/Opera): Soon
 Webkit

    (Apple, etc.): Also soon?
 MS: ?

33. <picture> + srcset:
 http://picture.responsiveimages.org/ Mozilla Q1
 Blink (Chrome/Opera) Soon
 Webkit

    (Apple, etc.) Also soon?
 MS ?

34. Client Hints:
 http://tools.ietf.org/html/draft-grigorik-http-client-hints-01

35. None

36. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

37. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

38. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

39. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

40. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

41. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

42. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>

43. <picture> <!-- art directed sources --> <source media="(min-width: 45em)" src="large.jpg"

    /> <source media="(min-width: 18em)" src="med.jpg" /> ! <!-- fallback --> <img src="small.jpg" alt="A rad wolf" /> </picture>
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45. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>

46. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>

47. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>

48. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>

49. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>

50. <picture> <!-- sources @ different resolutions --> <source srcset="pic1x.jpg 1x,

    pic2x.jpg 2x, pic4x.jpg 4x" /> ! <!-- fallback --> <img src="pic1x.jpg" alt="A rad wolf" /> </picture>
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52. <img srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x" src="pic1x.jpg" alt="A rad

    wolf" />

53. <img srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x" src="pic1x.jpg" alt="A rad

    wolf" />

54. <img srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x" src="pic1x.jpg" alt="A rad

    wolf" />

55. <img srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x" src="pic1x.jpg" alt="A rad

    wolf" />

56. <img srcset="pic1x.jpg 1x, pic1.5x.jpg 1.5x, pic2x.jpg 2x, pic4x.jpg 4x" src="pic1x.jpg"

    alt="A rad wolf" />
57. None

58. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>

59. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>

60. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>

61. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>

62. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>

63. <picture> <source media="(min-width: 45em)" srcset="large1.jpg 1x, large2.jpg 2x" /> <source

    media="(min-width: 18em)" srcset="med1.jpg 1x, med2.jpg 2x" /> <source srcset="small1.jpg 1x, small2.jpg 2x" /> <img src="small1.jpg" alt="A rad wolf" /> </picture>
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65. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

66. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

67. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

68. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

69. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

70. <picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w" />

    ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>
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72. <picture> <source sizes="(min-width: 45em) 33%, (min-width: 18em) 50%, 100%" srcset="pic400.jpg

    400w, pic800.jpg 800w, pic1600.jpg 1600w" /> ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>

73. <picture> <source sizes="(min-width: 45em) 33%, (min-width: 18em) 50%, 100%" srcset="pic400.jpg

    400w, pic800.jpg 800w, pic1600.jpg 1600w" /> ! <img src="pic400.jpg" alt="A rad wolf" /> </picture>
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75. <picture> <source type="image/webp" src="wolf.webp" /> <img src="wolf.jpg" alt="A rad wolf"

    /> </picture>

76. <picture> <source type="image/webp" src="wolf.webp" /> <img src="wolf.jpg" alt="A rad wolf"

    /> </picture>

77. <picture> <source type="image/webp" src="wolf.webp" /> <img src="wolf.jpg" alt="A rad wolf"

    /> </picture>

78. <picture> <source type="image/webp" src="wolf.webp" /> <img src="wolf.jpg" alt="A rad wolf"

    /> </picture>

79. http://picture.responsiveimages.org/

80. Picturefill by Scott Jehl https://github.com/scottjehl/picturefill

81. <span data-picture> <span data-source data-srcset="" data-src="" data-type="" data-media=""></span> <noscript> <img

    /> </noscript> </span>

82. <span data-picture> <span data-source data-srcset="" data-src="" data-type="" data-media=""></span> <noscript> <img

    /> </noscript> </span>

83. <span data-picture> <span data-source data-srcset="" data-src="" data-type="" data-media=""></span> <noscript> <img

    /> </noscript> </span>

84. <span data-picture> <span data-source data-srcset="" data-src="" data-type="" data-media=""></span> <noscript> <img

    /> </noscript> </span>

85. Imager https://github.com/BBC-News/Imager.js RWD.Images https://github.com/stowball/rwd.images.js

86. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG

87. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG
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91. Resource Priorities http://www.w3.org/TR/resource-priorities/

92. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG

93. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG

94. ImageOptim-CLI http://jamiemason.github.io/ImageOptim-CLI/

95. grunt-svgmin https://github.com/sindresorhus/grunt-svgmin Scour https://launchpad.net/scour

96. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG

97. Responsible Images:! Responsive Images Resource Priorities Image Optimization Use Fewer

    Images Use SVG

98. Responsible Images:! Responsive Images Resource Priorities Image Optimization Fewer Images

    Use SVG

99. Responsible Images:! Responsive Images Resource Priorities Image Optimization Fewer Images

    SVG

100. Impact

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103. 1,870KB 564KB 3,505KB Images (content) Images (style) Other content

104. Optimizations • ImageOptim-CLI on all images • WebP • Responsive

     images using Picturefill, for DPI- and viewport switching on content images

105. 1,870KB 564KB 3,505KB Images (content) Images (style) Other content

106. 1,870KB 72KB 261KB Images (content) Images (style) Other content

107. 1,870KB 72KB 534KB Images (content) Images (style) Other content

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109. “Good performance is good design” Brad Frost

110. “Responsible images are good design” Dave Newton

111. David Newton! @newtron on Twitter @nwtn on GitHub david@davidnewton.ca