[php[world] 2016] Every Millisecond Counts: Performance & UX

Fee39f0c0ffb29d9ac21607ed188be6b?s=47 Davey Shafik
November 17, 2016

[php[world] 2016] Every Millisecond Counts: Performance & UX

How do you lose 900 million dollars in 100ms? Or 8 million visits in just 4/10 of a second? User expectations are higher than ever when it comes to web performance, so much so that we’ve created an entirely new application architecture just to make it feel like our websites are faster than they actually are.

This talk will look at how we can improve our users experience at any scale through performance optimizations at every layer of the stack, from backend to browser.

Fee39f0c0ffb29d9ac21607ed188be6b?s=128

Davey Shafik

November 17, 2016
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Transcript

  1. E V E R Y M I L L I

    S E CO N D CO U N TS P E R F O R M A N C E A N D U S E R E X P E R I E N C E
  2. D AV E Y S H A F I K

    • Developer • Author • Open Source Contributor • Release Manager for PHP 7.1 • @dshafik
  3. h tt p : / /d e v e l

    o p e r. a ka m a i .co m
  4. Let’s start a conversation about mental health in tech mhprompt.org

  5. W H Y P E R FO R M A

    N C E M AT T E RS CC-BY-ND 2.0: Raymond June
  6. A M A ZO N CC-BY 2.0: Thomas Shahan

  7. LO S E S 1 % O F R E

    V E N U E P E R 1 0 0 M S S O U R C E : H T T P : / / R A D A R . O R E I L LY. C O M / 2 0 0 8 / 0 8 / R A D A R - T H E M E - W E B - O P S . H T M L
  8. $ 8 8 9 , 9 0 0 , 0

    0 0 2 0 1 4
  9. 1 2 . 5 ¢ FO R E V E

    R Y S I N G L E P E RS O N O N E A RT H 2 0 1 4
  10. $ 2 . 7 9 P E R US C

    I T I Z E N 2 0 1 4
  11. R E M I N D E R : P

    E R 1 0 0 M S S LO W E R !
  12. G O O G L E CC-BY: Robert Scoble

  13. 0 . 5 S S LO W E R =

    2 0 % L E SS S E A R C H E S S O U R C E : H T T P : / / G L I N D E N . B L O G S P O T. C O M / 2 0 0 6 / 1 1 / M A R I S S A - M AY E R - AT- W E B - 2 0 . H T M L
  14. B I N G CC-BY-SA 2.0: badgreeb RECORDS

  15. 2 S S LO W E R = - 4

    . 3 % R E V E N U E / U S E R S O U R C E : H T T P : / / V E L O C I T Y C O N F. C O M / V E L O C I T Y 2 0 0 9 / P U B L I C / S C H E D U L E / D E TA I L / 8 5 2 3
  16. G Q CC-BY 2.0: BIAU Guillaume

  17. CU T LOA D T I M E BY 8

    0 % : T R A F F I C + 8 0 % & T I M E S P E N T + 3 2 % S O U R C E : H T T P : / / D I G I D AY. CO M / P U B L I S H E RS /G Q - CO M - CU T- PA G E - LOA D -T I M E - 8 0 - P E R C E N T/
  18. M O R E

  19. • WALMART: 1s improvement = 2% increase in conversions •

    ETSY: +160KB of images mobile site = 12% increase in bounce rate • STAPLES: 1s improvement = 10% increase in conversions S O U R C E : H T T P : / / W W W. S L I D E S H A R E . N E T/C L I F FC R O C K E R / V E LO C I TY- N Y- H O W-TO - M E A S U R E - R E V E N U E - I N - M I L L I S E CO N D S S O U R C E : H T T P : / / R A D A R . O R E I L LY. CO M / 2 0 1 4 / 0 1 / W E B - P E R FO R M A N C E - I S - US E R- E X P E R I E N C E . H T M L S O U R C E : H T T P : / / W W W. S L I D E S H A R E . N E T/ D E VO N AU E RS W A L D/ W A L M A RT- PA G E S P E E D S L I D E
  20. CO N C LUS I O N

  21. US E RS C A N P E R C

    E I V E T I N Y C H A N G E S I N P E R F O R M A N C E A S L I T T L E A S 1 4 M S
  22. S LO W E R S I T E S

    M A K E CUSTO M E RS L E SS H A P P Y
  23. L E SS H A P PY = P O

    O R US E R E X P E R I E N C E
  24. YO U P R O B A B LY N

    OT I C E D I T YO U RS E L F…
  25. 1 0 S E CO N D S I S

    A N E T E R N I TY
  26. M O B I L E : 5 3 %

    B O U N C E A F T E R 3 S S O U R C E : H T T P S : / / W W W. S OA STA . CO M / B LO G /G O O G L E - M O B I L E -W E B - P E R F O R M A N C E -ST U DY/
  27. W H O I S R E S P O

    N S I B L E FO R P E R FO R M A N C E ? CC-BY 2.0: davetoaster
  28. E V E R YO N E ! CC-BY 2.0:

    James Cridland
  29. E V E R YO N E ! • Designers

    • Sysadmins/Devops • Backend Developers • Frontend Developers • Browser Vendors
  30. W H AT M A K E S A W

    E B PA G E ? CC-BY-SA 2.0: Susanne Nilsson
  31. TOTA L PA G E W E I G H

    T D I ST R I B U T I O N HTTP Archive – September 2015 http://httparchive.org/trends.php Fonts 5% CSS 3% JS 17% HTML 3% Images 63% Other 9%
  32. TOTA L PA G E W E I G H

    T ( M B ) 0-1MB 1-2MB 2-3MB 3-4MB 4-5MB 5-6MB 6-8MB 3% 2% 4% 8% 15% 28% 36%
  33. TOTA L R E Q U E STS P E

    R PA G E 1-25 26-50 51-75 76-100 101-125 126-150 > 150 15% 8% 12% 16% 18% 16% 11%
  34. D E S I G N E RS CC-BY 2.0:

    Cliff Hutson
  35. CO M P R E SS YO U R I

    M AG E S ( O R D E V E LO P E RS W I L L D O I T FO R YO U ! )
  36. SYS A D M I N S / D E

    V O P S CC-BY-SA 2.0: Bjorn Watland
  37. E N A B L E H T T P/

    2
  38. L E T ’ S E N C R Y

    PT ! CC-BY: Jason Baker
  39. L E TS E N C R Y PT. O

    R G Attribution
  40. L E TS E N C R Y PT. O

    R G • Free (as in beer) • Automatic • Secure • Transparent • Open • Cooperative
  41. U S E T H E C LO U D

    TO S C A L E B A S E D 
 O N P E R C E I V E D P E R F O R M A N C E CC-BY 2.0: Steve Jurvetson
  42. S C A L E D B A S E

    D O N P E R C E I V E D P E R F O R M A N C E • Resource usage doesn’t tell you the whole story • Use SpeedIndex scores as an additional metric to determine scaling thresholds • Use marcelduran / webpagetest-api (node)
  43. var WebPageTest = require('webpagetest'); var http = require('http'); var wpt

    = new WebPageTest('www.webpagetest.org', ‘KEY HERE'); wpt.runTest('https://daveyshafik.com', {pageSpeed: true}, function(err, data) { console.log("Test results at: " + data.data.jsonUrl); checkResponse(data.data.jsonUrl); }); function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = ''; response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  44. var WebPageTest = require('webpagetest'); var http = require('http'); var wpt

    = new WebPageTest('www.webpagetest.org', ‘KEY HERE'); wpt.runTest('https://daveyshafik.com', {pageSpeed: true}, function(err, data) { console.log("Test results at: " + data.data.jsonUrl); checkResponse(data.data.jsonUrl); }); function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = ''; response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData);
  45. var WebPageTest = require('webpagetest'); var http = require('http'); var wpt

    = new WebPageTest('www.webpagetest.org', ‘KEY HERE'); wpt.runTest('https://daveyshafik.com', {pageSpeed: true}, function(err, data) { console.log("Test results at: " + data.data.jsonUrl); checkResponse(data.data.jsonUrl); }); function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = ''; response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData);
  46. var WebPageTest = require('webpagetest'); var http = require('http'); var wpt

    = new WebPageTest('www.webpagetest.org', ‘KEY HERE'); wpt.runTest('https://daveyshafik.com', {pageSpeed: true}, function(err, data) { console.log("Test results at: " + data.data.jsonUrl); checkResponse(data.data.jsonUrl); }); function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = ''; response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData);
  47. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  48. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  49. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  50. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  51. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  52. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  53. function checkResponse(reportUrl) { http.get(reportUrl, function(response) { var responseData = '';

    response.on('data', function(data) { responseData += data; }); response.on('end', function() { var data = JSON.parse(responseData); if (data.statusCode == 200) { console.log("First view: " + data.data.average.firstView.SpeedIndex); console.log("Repeat view: " + data.data.average.repeatView.SpeedIndex); } else { console.log(data.statusText); setTimeout(function () { checkResponse(reportUrl); }, 5000); } }); }); }
  54. None
  55. B A C K E N D D E V

    E LO P E RS CC-BY 2.0: Bobo Boom
  56. C A C H E A G G R E

    S S I V E LY CC-BY: Travis Wise
  57. D ATA B A S E C AC H I

    N G
  58. D ATA B A S E C AC H I

    N G • Memcache • Cassandra
  59. F U L L PAG E C AC H I

    N G
  60. F U L L PA G E C A C

    H I N G • Memcache • Cassandra • Varnish • Squid
  61. E D G E S I D E I N

    C LU D E S ( E S I )
  62. E D G E S I D E I N

    C LU D E S • Created by Akamai (and some other companies) • Partially supported by Varnish, Squid, and others • Uses special HTML tags to cache fragments of pages differently than rest of the page • e.g. no caching, different TTL, per user session, or per geographic area
  63. E X A M P L E E D G

    E S I D E I N C LU D E : LO G I N <esi:include src="personal-greeting.html"/> <esi:remove> Hello! </esi:remove>
  64. E X A M P L E E D G

    E S I D E I N C LU D E : LO G I N <esi:include src="personal-greeting.html"/> <esi:remove> Hello! </esi:remove>
  65. E X A M P L E E D G

    E S I D E I N C LU D E : LO G I N <esi:include src="personal-greeting.html"/> <esi:remove> Hello! </esi:remove>
  66. I M AG E S

  67. F O R M AT N E G OT I

    AT I O N
  68. J P E G X R W E B P

    ɂ Ʌɚ
  69. CO M P R E SS I O N

  70. J P E G L E V E LS :

    0 - 1 0 0 T H E Y ’ R E W H AT E V E R T H E E N CO D E R W A N TS T H E M TO M E A N
  71. P E R C E I V E D Q

    UA L I TY
  72. Q UA L I TY H U M A N

    S C A N S E E P E R C E I V E D Q UA L I TY
  73. None
  74. O R I G I N A L : 1

    6 . 8 M B
  75. 9 0 : 5 . 8 M B

  76. 8 0 : 4 . 2 M B

  77. 7 0 : 3 . 2 M B

  78. 6 0 : 2 . 5 M B

  79. 5 0 : 1 . 9 M B

  80. 4 0 : 1 . 4 M B

  81. 3 0 : 1 . 2 M B

  82. 2 0 : 9 5 0 K B

  83. 1 0 : 5 9 4 K B

  84. 0 : 3 9 3 K B

  85. O R I G I N A L

  86. 0

  87. SS I M S T R U CT U R

    A L S I M I L A R I TY I M AG E
  88. E M M Y A W A R D W

    I N N I N G A LG O R I T H M Zhou Wang, Alan C. Bovik, Hamid R. Sheikh, and Eero P. Simoncelli
  89. SS I M A LG O R I T H

    M • Brightness • Contrast • Structure • Fast
  90. D SS I M ST R U CT U R

    A L D I SS I M I L A R I TY: D I STA N C E M E T R I C D E R I V E D F R O M SS I M
  91. AUTOPLAY

  92. 0.009273 /images/90.png 0.008136 /images/80.png 0.009007 /images/70.png 0.010287 /images/60.png 0.012078 /images/50.png

    0.014768 /images/40.png 0.017413 /images/30.png 0.020712 /images/20.png 0.028642 /images/10.png 0.038585 /images/0.png
  93. P E R C E PT I V E Q

    UA L I TY T H R E S H O L D
  94. Original: 14.1MB 80: 0.008136 4.6MB 30: 0.017413 1.2MB 50: 0.012078

    1.9MB
  95. -91.4%

  96. F R O N T E N D D E

    V E LO P E RS CC-BY 2.0: Bill Jacobus
  97. P R E D I CT I V E B

    R O W S I N G
  98. P R E B R O W S I N

    G
  99. P R E B R O W S I N

    G 1. DNS Prefetch 2. TCP Preconnect 3. Prefetch 4. Prerender
  100. D N S P R E F E TC H

    TC P P R E CO N N E CT P R E LOA D P R E R E N D E R ɐ Ɇ Ȑ  ɂ 10.0.0.1 127.0.0.1
  101. D N S P R E F E TC H

  102. <head> <link rel="dns-prefetch" href="//example.org"> </head> D N S P R

    E F E TC H
  103. <head> <link rel="dns-prefetch" href="//example.org"> </head> D N S P R

    E F E TC H
  104. <head> <link rel="dns-prefetch" href="//example.org"> </head> D N S P R

    E F E TC H
  105. <head> <link rel="preconnect" href="https://example.org"> </head> P R E CO N

    N E CT
  106. <head> <link rel="prefetch" href="/page/2"> </head> P R E F E

    TC H
  107. <head> <link rel="prefetch" href="/page/2"> </head> P R E F E

    TC H
  108. <head> <link rel="prerender" href="/page/2"> </head> P R E R E

    N D E R
  109. W A R N I N G ! CC-BY 2.0:

    Robert Couse-Baker
  110. 1-25 26-50 51-75 76-100 101-125 126-150 > 150 15% 8%

    12% 16% 18% 16% 11% 0-1MB 1-2MB 2-3MB 3-4MB 4-5MB 5-6MB 6-8MB 3% 2% 4% 8% 15% 28% 36% Fonts 5% CSS 3% JS 17% HTML 3% Images 63% Other 9% YO U H AV E TO R E N D E R T H E E N T I R E PAG E !
  111. R E L = P R E LOA D

  112. P R E F E TC H VS P R

    E LO A D
  113. P R E LOA D V S P R E

    F E TC H • prefetch is an optional and low-priority fetch for a resource that might be used by a subsequent navigation • preload is a mandatory and high-priority fetch for a resource that is necessary for the current navigation • preload is typically sent as a header, rather than a <link> tag
  114. L I N K H E A D E R

    Link: /resource; rel=preload
  115. N E W A R C H I T E

    CT U R E S
  116. H T T P/ 1 . X S U C

    K S CC-BY: Flóra Soós
  117. H T T P/ 1 . X S U C

    K S • Minify + Concat JavaScript and CSS • Inlining small JavaScript and CSS • Using image sprites • Using data: URIs • Domain sharding
  118. T H E S E T H I N G

    S A R E A L L " C L E V E R " H AC K S CC-BY: Matt Biddulph
  119. M U LT I P L E X I N

    G CC-BY: Alosh Bennett C A N U S E O N E C O N N E C T I O N F O R P A R A L L E L R E Q U E S T S
  120. S E R V E R P US H CC-BY:

    Steven Depolo
  121. D E P E N D E N C I

    E S CC-BY-SA 2.0: David Gamez
  122. W E I G H TS CC-BY 2.0: Tri Vu

    Dao
  123. D E L I V E R I N G

    A PAG E
  124. PAG E A SS E TS GET /index.html 200 OK

    text/html Ɇ ɂ Ȑ
  125. PAG E A SS E TS Ɇ Ȑ ɂ GET

    /index.html 200 OK text/html critical-path.css critical-path.js logo.svg font.eot styles.css main.js
  126. I N S U M M A R Y

  127. P E R F O R M A N C

    E M AT T E RS
  128. T I M E = M O N E Y

  129. T I M E = U S E R S

    AT I S FA CT I O N = M O N E Y
  130. P E R F O R M A N C

    E = US E R E X P E R I E N C E
  131. F E E D B AC K & Q U

    E ST I O N S Feedback: Twitter: Email: Slides: https://joind.in/talk/ @dshafik dshafik@akamai.com http://daveyshafik.com/slides ed949