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
Android Audio: Beyond Winning On It
Avatar for Atsushi Eno atsushieno
0
2.1k
250905 大吉祥寺.pm 2025 前夜祭 「プログラミングに出会って20年、『今』が1番楽しい」
Avatar for Masaya Kudo msykd
PRO
1
980
要件定義・デザインフェーズでもAIを活用して、コミュニケーションの密度を高める
Avatar for KazukiHayase kazukihayase
0
120
テストを軸にした生き残り術
Avatar for KNOWLEDGE WORK / 株式会社ナレッジワーク kworkdev
PRO
0
210
自作JSエンジンに推しプロポーザルを実装したい！
Avatar for Saji sajikix
1
180
Terraformで構築する セルフサービス型データプラットフォーム / terraform-self-service-data-platform
Avatar for pei0804 pei0804
1
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
230
AWSで始める実践Dagster入門
Avatar for キタガワ kitagawaz
1
660
バイブスに「型」を！Kent Beckに学ぶ、AI時代のテスト駆動開発
Avatar for amixedcolor amixedcolor
2
570
Platform開発が先行する Platform Engineeringの違和感
Avatar for KintoTech_Dev kintotechdev
4
580
EncryptedSharedPreferences が deprecated になっちゃった！どうしよう！ / Oh no! EncryptedSharedPreferences has been deprecated! What should I do?
Avatar for Yuki Anzai yanzm
0
450
LLMを搭載したプロダクトの品質保証の模索と学び
Avatar for SmartHR 品質保証部 qa
0
1.1k

Featured

See All Featured
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
18
1.1k
How to Think Like a Performance Engineer
Avatar for Harry Roberts csswizardry
26
1.9k
Easily Structure & Communicate Ideas using Wireframe
Avatar for Afnizar Nur Ghifari afnizarnur
194
16k
How GitHub (no longer) Works
Avatar for Zach Holman holman
315
140k
StorybookのUI Testing Handbookを読んだ
Avatar for Shingo Yamazaki zakiyama
31
6.1k
Build The Right Thing And Hit Your Dates
Avatar for Maggie C. maggiecrowley
37
2.9k
Large-scale JavaScript Application Architecture
Avatar for Addy Osmani addyosmani
513
110k
Building Applications with DynamoDB
Avatar for Matt Wood mza
96
6.6k
The Psychology of Web Performance [Beyond Tellerrand 2023]
Avatar for Tammy Everts tammyeverts
49
3k
No one is an island. Learnings from fostering a developers community.
Avatar for Antonio thoeni
21
3.4k
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
126
17k
Agile that works and the tools we love
Avatar for Rasmus Luckow-Nielsen rasmusluckow
330
21k

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