Upgrade to Pro — share decks privately, control downloads, hide ads and more …

How to make your boss speed-curious and other w...

Avatar for Peter Hedenskog Peter Hedenskog
September 04, 2014
Technology
0
180

How to make your boss speed-curious and other webperf tricks - coldfront2014

My presentation from ColdFront2014:
http://coldfrontconf.com/

Avatar for Peter Hedenskog

Peter Hedenskog

September 04, 2014
Tweet

More Decks by Peter Hedenskog

See All by Peter Hedenskog
Keeping Wikipedia fast [WeLoveSpeed]
Avatar for Peter Hedenskog soulislove
1
480
Measuring Web Performance for Wikipedia using synthetic testing tools
Avatar for Peter Hedenskog soulislove
0
430
Measuring Web Performance Using Selenium
Avatar for Peter Hedenskog soulislove
2
840
Monitoring Web Performance using Open Source tools (Stockholm)
Avatar for Peter Hedenskog soulislove
2
240
Monitoring web performance using Open Source tools (San Francisco & Silicon Valley Web Performance Group)
Avatar for Peter Hedenskog soulislove
1
350
Monitoring web performance using Open Source tools (South Bay JavaScript Meetup)
Avatar for Peter Hedenskog soulislove
0
240
Optimise your home page (fast as lightning)
Avatar for Peter Hedenskog soulislove
1
55
Integrating performance tools into continuous delivery
Avatar for Peter Hedenskog soulislove
0
270
Sitespeed.io Lightning demo @ Velocity Santa Clara 2014
Avatar for Peter Hedenskog soulislove
0
120

Other Decks in Technology

See All in Technology
Language Update: Java
Avatar for Yuichi.Sakuraba skrb
2
260
ChatGPTとPlantUML/Mermaidによるソフトウェア設計
Avatar for gowhich501 gowhich501
1
120
AI開発ツールCreateがAnythingになったよ
Avatar for s sato tendasato
0
110
Kubernetes における cgroup driver のしくみ: runwasi の bugfix より
Avatar for z63d z63d
2
190
Webブラウザ向け動画配信プレイヤーの 大規模リプレイスから得た知見と学び
Avatar for yud0uhu yud0uhu
0
210
サンドボックス技術でAI利活用を促進する
Avatar for k-nagase koh_naga
0
190
「魔法少女まどか☆マギカ Magia Exedra」の必殺技演出を徹底解剖！ -キャラクターの魅力を最大限にファンに届けるためのこだわり-
Avatar for gree_tech gree_tech
PRO
0
550
エニグモ_会社紹介資料（エンジニア職種向け）.pdf
Avatar for 株式会社エニグモ enigmo_hr
0
2.2k
AWSを利用する上で知っておきたい名前解決のはなし（10分版）
Avatar for nagisa_53 nagisa53
1
130
AIのグローバルトレンド2025 #scrummikawa / global ai trend
Avatar for kyonmm kyonmm
PRO
1
230
フィンテック養成勉強会#56
Avatar for フィンテック養成コミュニティ finengine
0
120
RSCの時代にReactとフレームワークの境界を探る
Avatar for uhyo uhyo
9
3k

Featured

See All Featured
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
Avatar for Tammy Everts tammyeverts
53
2.9k
BBQ
Avatar for Matthew Crist matthewcrist
89
9.8k
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
126
17k
It's Worth the Effort
Avatar for 3n 3n
187
28k
Stop Working from a Prison Cell
Avatar for Chris Michel hatefulcrawdad
271
21k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
Avatar for Stéphanie Walter stephaniewalter
285
13k
Thoughts on Productivity
Avatar for Jon Yablonski jonyablonski
70
4.8k
Imperfection Machines: The Place of Print at Facebook
Avatar for Scott Boms scottboms
268
13k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
507
140k
Dealing with People You Can't Stand - Big Design 2015
Avatar for Cassini Nazir cassininazir
367
27k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
Avatar for Morgane Peng morganepeng
131
19k
Become a Pro
Avatar for Speaker Deck speakerdeck
PRO
29
5.5k

Transcript

  1. How to make your boss speed-curious and other #webperf tricks

    Peter Hedenskog
  2. None
  3. None

  4. The Performance Golden Rule!

  5. 80-90% of the end-user response time is spent on the

    frontend.

  6. front end dev

  7. front end dev

  8. front end dev

  9. front end dev

  10. front end dev

  11. front end dev

  12. With great power …

  13. comes great responsibility!

  14. 2

  15. How to be really fast

  16. The boss

  17. World fastest web page

  18. None

  19. Start render: 0,2 s Visually Complete: 0,2 s

  20. What can we learn?

  21. What CDN are you using?

  22. We know the Golden rule!

  23. The rendering path

  24. 1. Download HTML

  25. 2. If CSS files then download

  26. 3. If JS files then download

  27. 4. DOM + CSSOM = render tree

  28. 5. Paint

  29. Optimize the rendering path

  30. “I like thinking big.” Donald Trump

  31. “Think small” Peter Hedenskog

  32. What?

  33. super computers

  34. super fast internet

  35. remember

  36. mobile phones

  37. data

  38. the city

  39. magic number

  40. 14:ish kb

  41. High Performance Browser Networking - Ilya Grigorik Paul Irish

  42. focus

  43. above the fold

  44. “Think small” Peter Hedenskog

  45. Overall

  46. minimize

  47. combine

  48. avoid requests

  49. no requests

  50. HTML

  51. DOM node depth

  52. CSS

  53. inline

  54. <head> ... <style> body { background: #fff; } ... </style>

    </head> <body>

  55. https://github.com/filamentgroup/loadCSS

  56. None

  57. NEVER

  58. Avoid reflow and repaint

  59. None

  60. Javascript

  61. JAVASCRIPT CAN BE EVIL

  62. JAVASCRIPT IS EVIL* *inside your rendering path

  63. Synchronously loaded Javascript blocks the rendering path!

  64. Example of non working

  65. NEVER

  66. use async <script src=“/js/calculate.js” async></script> https://www.igvita.com/2014/05/20/script-injected-async-scripts-considered-harmful/

  67. measure above the fold

  68. User Timing API

  69. window.performance. mark(‘logoLoaded’);

  70. window.performance. measure(‘logoTiming’, ‘navigationStart’, ‘logoLoaded’);

  71. var items = window.performance .getEntriesByType(' measure');

  72. None

  73. There’s a polyfill for that!

  74. https://gist.github.com/pmeenan/5902672

  75. Demo

  76. front end dev

  77. The boss

  78. 2 kinds

  79. money

  80. http:// www.peterhedenskog.com/ blog/2014/09/more-speed- more-money/

  81. end user Be kind to your users! Mother Theresa

  82. < 0.1 second - instant < 1.0 second - flow

    =>10 seconds - lost ! Robert B. Miller - Response Time in Man-Computer Conversational Transactions (1968) The brain

  83. Visualize

  84. Your boss understands red, yellow and green

  85. 1200 ms

  86. red 1200 ms

  87. yellow 1200 ms

  88. green 1200 ms

  89. None

  90. x

  91. we are 12% slower than …

  92. None

  93. summary

  94. front end dev

  95. None

  96. small

  97. None

  98. •Peter in Denmark - Lars Von Trier •Donald Trump -

    Gage Skidmore •Super computer - Zdjęcia Arkadiusz Sikorski •Monkey with iphone - Marsel Van Oosten •The house - Bert Kaufmann •Stop light peppers - Dennis S Hurd •What is this? - Jeff Carson •Corcovado jesus - Doug88888 •Developers - Austin Wordpress Camp •The evil king - HBO •Pippi Longstocking - Ingrid Vang Nyman •Montgomery Burns - Matt Groening •The dog - Emiliano •Paint over - franziska •Super heroes - Marvel •Vee - Netflix Image credits

  99. Thank you! Peter Hedenskog [email protected] @soulislove