Cast a wider net

•

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jlembeck

Talk given on 9/3/2015 at Ada Developer's Academy on network requests and accessibility

Technology

GET / HTTP/1.1
Host: www.google.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac
OS X 10.10; rv:40.0) Gecko/20100101 Firefox/
40.0

JIT Compiler
Very smart people made JS a lot faster

project/
|_ js/
|_ lib/
|_ jquery.js
|_ posts.js
|_ users.js
|_ admin.js
=>
project/
|_ build/
_ js/
|_ all.js
JUST ONE REQUEST
Concatenate

Example - jQuery
CONCAT! =>
One File - 276.79KB
MINIFY! =>
One File - 93.66KB
GZIP!
One File - 32.55KB
=>

async runs only when fully available
and not blocking

defer runs only when the DOM
is completely built

async load everything
not critical
https://www.ﬁlamentgroup.com/lab/weight-wait.html

TOP SITES KNOW:
Performance is critical
page load +500ms = 3% drop in traffic 
page load +1000ms = 6% drop
page load +100ms = 1% loss in sales
page load +500ms = 25% fewer searches
page load +400ms = 5–9% drop in traffic
http://www.guypo.com/business/17-statistics-to-sell-web-performance-optimization/

“Online shoppers expected pages
to load in 2 seconds or fewer —
and at 3 seconds, a large share
abandon the site.”
“For Impatient Web Users, an Eye Blink Is Just Too Long to Wait,” New York Times, February 29, 2012 
http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading-
sites.html?pagewanted=all&_r=0

“Only 20% of N. American customers have LTE-
enabled handsets. Globally, LTE penetration rate
is ~5%”
“Bursting our Bubble: Mobile Performance Outside the First World” Performance Calendar, December 3, 2014 
http://calendar.perfplanet.com/2014/bursting-our-bubble-mobile-performance-outside-the-first-world/

https://twitter.com/BenedictEvans/status/513017790920290304

Your Income Over the Next Few Years
Median Income for a
Seattle-based software
developer: ~$92,000
Median Income for a
Seattle-based household
(2011): ~$52,000

The entire world is not San Francisco and
Seattle

There are Over 8.7 Billion Internet-
Connected Devices Worldwide

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Cast a wider net

1. Casting a Wider Net

2. Hi

3. How Does a Browser Work?

4. The Densest Interview Question ever

6. DNS

7. Domain Name System

10.

11. ISP

12. {a-m}.root-servers.net

13. Top Level Domain

14. ns1.nameserver.com

15. IP Address and Port!

16. HTTP Request

17. GET / HTTP/1.1 Host: www.google.com User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/ 40.0

18. Headers Headers

19. Telnet. Oooo

20.

21.

22. TCP

23. Transmission Control Protocol

24. Synchronize/Acknowledge

25. Latency?

26. Grace Hopper

27. The Response - you know this part

28. 14KB

29. HTML

30. Parse

31. DOM Tree

32. Fetch External Resources

33. CSS ﬁles/style tags/style attributes

34. CSSOM

35. CASCADING

36. Weight, then Speciﬁcity, then Order

37. !important

38. IDs, classes, tags oh my

39. What’s next in line?

40. CSS BLOCKS Rendering

41. Render page

42. Position (box model)

43. Position (ﬂoats, absolutes, relatives)

44. Layer

45. Render

46. Make small changes for faster renders

47. JavaScript

48. Parse + Execution Time?

49. Compilers (overview)

50. Tokeniser

51. Parser

52. Translator 010100 100011 000111

53. Interpreter 010100 100011 000111

54. Sloooowwwww

55. JIT Compiler Very smart people made JS a lot faster

56. Very smart people made JS a lot faster

57. Very smart people made JS a lot faster

58. We done yet?

59. Images

60. Fonts

61. How do I make my stuff faster?

62. HTTP 1.1

63. Asset Pipeline

65. Minify => MAKES FILE SMALLER

66. gzip

67. Example - jQuery 79 Files to Start!

68. Example - jQuery CONCAT! => One File - 276.79KB MINIFY! => One File - 93.66KB GZIP! One File - 32.55KB =>

69. Scripts Block Parsing!

70. Head vs. Bottom Block Example

71. Use async or defer attributes

72. async runs only when fully available and not blocking

73. defer runs only when the DOM is completely built

74. Async load Fonts

75. async load everything not critical https://www.ﬁlamentgroup.com/lab/weight-wait.html

76. Server-Side Rendering

77. Special Tangent

78. Progressive Enhancement

79. Single Point of Failure

80.

81.

82.

83. Why do we care that it’s fast anyway?

84. TOP SITES KNOW: Performance is critical page load +500ms = 3% drop in traffic  page load +1000ms = 6% drop page load +100ms = 1% loss in sales page load +500ms = 25% fewer searches page load +400ms = 5–9% drop in traffic http://www.guypo.com/business/17-statistics-to-sell-web-performance-optimization/

85. “Online shoppers expected pages to load in 2 seconds or fewer — and at 3 seconds, a large share abandon the site.” “For Impatient Web Users, an Eye Blink Is Just Too Long to Wait,” New York Times, February 29, 2012  http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading- sites.html?pagewanted=all&_r=0

86. Mobile trafﬁc is increasing

87. Mobile Networks aren’t always speedy

88. “Only 20% of N. American customers have LTE- enabled handsets. Globally, LTE penetration rate is ~5%” “Bursting our Bubble: Mobile Performance Outside the First World” Performance Calendar, December 3, 2014  http://calendar.perfplanet.com/2014/bursting-our-bubble-mobile-performance-outside-the-first-world/

89. https://twitter.com/BenedictEvans/status/513017790920290304

90. Tangential Responsibility Rant

91. Your Income Over the Next Few Years Median Income for a Seattle-based software developer: ~$92,000 Median Income for a Seattle-based household (2011): ~$52,000

92. You are likely not your market

93. The entire world is not San Francisco and Seattle

94. There are Over 8.7 Billion Internet- Connected Devices Worldwide

95. Worldwide Mobile Browser Usage

96. Asian Mobile Browser Usage

97. African Mobile Browser Usage

98. South American Mobile Browser Usage

99. @jefﬂembeck