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
470
Measuring Web Performance for Wikipedia using synthetic testing tools
Avatar for Peter Hedenskog soulislove
0
420
Measuring Web Performance Using Selenium
Avatar for Peter Hedenskog soulislove
2
830
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
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
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
スプリントゴール未達症候群に送る処方箋
Avatar for KAKEHASHI kakehashi
PRO
1
180
BEYOND THE RAG🚀 ~とりあえずRAG？を超えていけ！ 本当に使えるAIエージェント＆生成AIプロダクトを目指して~ / BEYOND-THE-RAG-Toward Practical-GenerativeAI-Products-AOAI-DevDay-2025
Avatar for Junya Miyake jnymyk
4
230
Introduction to Sansan, inc / Sansan Global Development Center, Inc.
Avatar for Sansan, Inc. sansan33
PRO
0
2.7k
(HackFes)米国国防総省のDevSecOpsライフサイクルをAWSのセキュリティサービスとOSSで実現
Avatar for Shun Yoshie syoshie
5
650
データエンジニアリング 4年前と変わったこと、 4年前と変わらないこと
Avatar for Sotaro Tanaka tanakarian
2
340
Turn Your Community into a Fundraising Catalyst for Black Philanthropy Month
Avatar for Auctria auctria
PRO
0
110
CSPヘッダー導入で実現するWebサイトの多層防御：今すぐ試せる設定例と運用知見
Avatar for llamakko llamakko
1
130
ecspressoの設計思想に至る道 / sekkeinight2025
Avatar for FUJIWARA Shunichiro fujiwara3
6
540
LLM拡張解体新書/llm-extension-deep-dive
Avatar for oracle4engineer oracle4engineer
PRO
27
8k
Webの技術とガジェットで那須の子ども達にワクワクを！ / IoTLT_20250720
Avatar for you（@youtoy） you
PRO
0
120
TROCCO今昔
Avatar for gtnao gtnao
0
210
Jitera Company Deck / JP
Avatar for Jitera Inc. jitera
0
130

Featured

See All Featured
Practical Tips for Bootstrapping Information Extraction Pipelines
Avatar for Matthew Honnibal honnibal
PRO
21
1.3k
The Cult of Friendly URLs
Avatar for Andy Hume andyhume
79
6.5k
For a Future-Friendly Web
Avatar for Brad Frost brad_frost
179
9.8k
How To Stay Up To Date on Web Technology
Avatar for Chris Coyier chriscoyier
790
250k
Designing for Performance
Avatar for Lara Hogan lara
610
69k
jQuery: Nuts, Bolts and Bling
Avatar for Doug Neiner dougneiner
63
7.8k
Mobile First: as difficult as doing things right
Avatar for Swwweet swwweet
223
9.7k
Unsuck your backbone
Avatar for Amy Palamountain ammeep
671
58k
Intergalactic Javascript Robots from Outer Space
Avatar for Vicent Martí tanoku
271
27k
GraphQLとの向き合い方2022年版
Avatar for Yosuke Kurami quramy
49
14k
ピンチをチャンスに：未来をつくるプロダクトロードマップ #pmconf2020
Avatar for Aki / @LoveIdahoBurger aki_iinuma
126
53k
Code Reviewing Like a Champion
Avatar for maltzj maltzj
524
40k

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