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

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

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for Peter Hedenskog Peter Hedenskog
September 04, 2014
Technology
200
0

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

More Decks by Peter Hedenskog

See All by Peter Hedenskog
Keeping Wikipedia fast [WeLoveSpeed]
Avatar for Peter Hedenskog soulislove
1
530
Measuring Web Performance for Wikipedia using synthetic testing tools
Avatar for Peter Hedenskog soulislove
0
490
Measuring Web Performance Using Selenium
Avatar for Peter Hedenskog soulislove
2
970
Monitoring Web Performance using Open Source tools (Stockholm)
Avatar for Peter Hedenskog soulislove
2
260
Monitoring web performance using Open Source tools (San Francisco & Silicon Valley Web Performance Group)
Avatar for Peter Hedenskog soulislove
1
380
Monitoring web performance using Open Source tools (South Bay JavaScript Meetup)
Avatar for Peter Hedenskog soulislove
0
260
Optimise your home page (fast as lightning)
Avatar for Peter Hedenskog soulislove
1
70
Integrating performance tools into continuous delivery
Avatar for Peter Hedenskog soulislove
0
310
Sitespeed.io Lightning demo @ Velocity Santa Clara 2014
Avatar for Peter Hedenskog soulislove
0
140

Other Decks in Technology

See All in Technology
小さくはじめるSLI/SLO ～育てながら組織に定着させる実践知～ / Starting Small with SLI/SLOs: Building Adoption Through Continuous Growth
Avatar for Narimichi Takamura nari_ex
7
1.9k
攻撃者視点で考えるDetection Engineering
Avatar for Ruslan Sayfiev cryptopeg
3
1.8k
20260619 私の日常業務での生成 AI 活用
Avatar for Masaru Ogura masaruogura
1
210
Android の公式 Skill / Android skills
Avatar for Yuki Anzai yanzm
0
150
中期計画、2回作ってみた　～業務委託と正社員、両方の視点から～
Avatar for 株式会社出前館 demaecan
1
800
Snowflakeと仲良くなる第一歩
Avatar for あべ coco_se
4
470
自宅LLMの話
Avatar for Kazuto Kusama jacopen
1
580
【NRUG vol.18】KubernetesにおけるNew Relicデータ取得量削減の考え方
Avatar for NRUG member nrug_member
0
120
2026TECHFRESH畢業分享會 - AI 時代的人生存檔點
Avatar for LINE Developers Taiwan line_developers_tw
PRO
0
1k
2026 TECHFRESH 畢業分享會 - AI-Native 重塑軟體工程與虛擬講師
Avatar for LINE Developers Taiwan line_developers_tw
PRO
0
1k
作って終わりにしない タイミーのセマンティックレイヤー育成の現在地
Avatar for chanyou0311 chanyou0311
4
2.4k
失敗を資産に変えるClaude Code
Avatar for Shinya Saita shinyasaita
0
660

Featured

See All Featured
Dominate Local Search Results - an insider guide to GBP, reviews, and Local SEO
Avatar for Greg Gifford greggifford
PRO
0
190
Prompt Engineering for Job Search
Avatar for Mfonobong Umondia mfonobong
0
340
AI Search: Implications for SEO and How to Move Forward - #ShenzhenSEOConference
Avatar for Aleyda Solis aleyda
1
1.3k
GraphQLの誤解/rethinking-graphql
Avatar for sonatard sonatard
75
12k
Data-driven link building: lessons from a $708K investment (BrightonSEO talk)
Avatar for Szymon Słowik szymonslowik
1
1.1k
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
128
18k
How to audit for AI Accessibility on your Front & Back End
Avatar for davetheseo davetheseo
0
430
Marketing Yourself as an Engineer | Alaka | Gurzu
Avatar for Gurzu gurzu
0
230
Testing 201, or: Great Expectations
Avatar for Joseph Mastey jmmastey
46
8.2k
Performance Is Good for Brains [We Love Speed 2024]
Avatar for Tammy Everts tammyeverts
12
1.7k
Neural Spatial Audio Processing for Sound Field Analysis and Control
Avatar for NII S. Koyama's Lab skoyamalab
0
330
Building a A Zero-Code AI SEO Workflow
Avatar for Ian Lurie portentint
PRO
0
590

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