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
『FailNet～やらかし共有SNS～』エレベーターピッチ
Avatar for yoko yokomachi
1
200
DDD集約とサービスコンテキスト境界との関係性
Avatar for Aja9tochin pandayumi
2
250
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
170
「魔法少女まどか☆マギカ Magia Exedra」のグローバル展開を支える、開発チームと翻訳チームの「意識しない協創」を実現するローカライズシステム
Avatar for gree_tech gree_tech
PRO
0
500
「魔法少女まどか☆マギカ Magia Exedra」での負荷試験の実践と学び
Avatar for gree_tech gree_tech
PRO
0
500
事業価値と Engineering
Avatar for Recruit recruitengineers
PRO
8
5.6k
異業種出身エンジニアが気づいた、転向して十数年経っても変わらない自分の武器とは
Avatar for macneko-ayu macnekoayu
0
280
AWS環境のリソース調査を Claude Code で効率化 / aws investigate with cc devio2025
Avatar for MasahiroKawahara masahirokawahara
2
1.2k
退屈なことはDevinにやらせよう〜〜Devin APIを使ったVisual Regression Testの自動追加〜
Avatar for ryo kawamataryo
4
1.4k
研究開発と製品開発、両利きのロボティクス
Avatar for Yutaka Kondo youtalk
1
290
Bye-Bye Query Spaghetti: Write Queries You'll Actually Understand Using Pipelined SQL Syntax
Avatar for Tobias Lampert tobiaslampertlotum
0
130
7月のガバクラ利用料が高かったので調べてみた
Avatar for 高橋広和 techniczna
3
830

Featured

See All Featured
The Success of Rails: Ensuring Growth for the Next 100 Years
Avatar for Eileen M. Uchitelle eileencodes
46
7.6k
Why You Should Never Use an ORM
Avatar for John Nunemaker jnunemaker
PRO
59
9.5k
A Modern Web Designer's Workflow
Avatar for Chris Coyier chriscoyier
696
190k
Distributed Sagas: A Protocol for Coordinating Microservices
Avatar for Caitie McCaffrey caitiem20
333
22k
Mobile First: as difficult as doing things right
Avatar for Swwweet swwweet
224
9.9k
VelocityConf: Rendering Performance Case Studies
Avatar for Addy Osmani addyosmani
332
24k
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
56
5.8k
Navigating Team Friction
Avatar for Lara Hogan lara
189
15k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
507
140k
No one is an island. Learnings from fostering a developers community.
Avatar for Antonio thoeni
21
3.4k
Large-scale JavaScript Application Architecture
Avatar for Addy Osmani addyosmani
512
110k
Performance Is Good for Brains [We Love Speed 2024]
Avatar for Tammy Everts tammyeverts
11
1.1k

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