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
460
Measuring Web Performance for Wikipedia using synthetic testing tools
Avatar for Peter Hedenskog soulislove
0
410
Measuring Web Performance Using Selenium
Avatar for Peter Hedenskog soulislove
2
810
Monitoring Web Performance using Open Source tools (Stockholm)
Avatar for Peter Hedenskog soulislove
2
230
Monitoring web performance using Open Source tools (San Francisco & Silicon Valley Web Performance Group)
Avatar for Peter Hedenskog soulislove
1
340
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
53
Integrating performance tools into continuous delivery
Avatar for Peter Hedenskog soulislove
0
260
Sitespeed.io Lightning demo @ Velocity Santa Clara 2014
Avatar for Peter Hedenskog soulislove
0
120

Other Decks in Technology

See All in Technology
人とAIとの共創を夢見た2か月 #共創AIミートアップ / Co-Creation with Keito-chan
Avatar for kondoyuko kondoyuko
1
700
ITエンジニアを取り巻く環境とキャリアパス / A career path for Japanese IT engineers
Avatar for 高玉 広和 / TAKATAMA Hirokazu takatama
4
1.5k
“⾞が通れるほど⼤きな”セキュリティーホールを抑えながらログインしたい
Avatar for taiseiue taiseiue
0
160
Introduction to Bill One Development Engineer
Avatar for Sansan, Inc. sansan33
PRO
0
240
新卒から4年間、20年もののWebサービスと向き合って学んだソフトウェア考古学 - PHPカンファレンス新潟2025 / new graduate 4year software archeology
Avatar for guri oguri
2
350
CloudBruteによる外部からのS3バケットの探索・公開の発見について / 20250605 Kumiko Hennmi
Avatar for SHIFT EVOLVE shift_evolve
3
130
積み上げられた技術資産と向き合いながら、プロダクトの信頼性をどう守るか
Avatar for PLAID Tech plaidtech
PRO
0
890
テストを実施する前に考えるべきテストの話 / Thinking About Testing Before You Test
Avatar for nihonbuson nihonbuson
PRO
13
2k
AIの電力問題を概観する
Avatar for Ryuichi Maruyama rmaruy
1
210
研究開発部メンバーの働き⽅ / Sansan R&D Profile
Avatar for Sansan, Inc. sansan33
PRO
3
17k
iOS/Androidで無限循環Carousel表現を考えてみる
Avatar for Fumiya Sakai fumiyasac0921
0
130
GoogleのAI Agent
Avatar for Shu Kobuchi shukob
0
130

Featured

See All Featured
Making Projects Easy
Avatar for Brett Harned brettharned
116
6.2k
Done Done
Avatar for chrislema chrislema
184
16k
How STYLIGHT went responsive
Avatar for nonsquared nonsquared
100
5.6k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
Avatar for Morgane Peng morganepeng
129
19k
The Art of Programming - Codeland 2020
Avatar for Erika Heidi erikaheidi
54
13k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
30
2.4k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
Avatar for Kevin Liebholz kevinliebholz
32
5.8k
10 Git Anti Patterns You Should be Aware of
Avatar for Lemi Orhan Ergin lemiorhan
PRO
656
60k
What's in a price? How to price your products and services
Avatar for Michael Herold michaelherold
245
12k
Navigating Team Friction
Avatar for Lara Hogan lara
186
15k
The Straight Up "How To Draw Better" Workshop
Avatar for Dennis Kardys denniskardys
233
140k
Writing Fast Ruby
Avatar for Erik Berlin sferik
628
61k

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