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Third party-performance (Airbnb Nerds, Nov 2013)

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Almost every site on the internet today serves 3rd-party assets and code - jQuery, analytics, trackers, share buttons, ads - from both their own servers and others - cloud providers, dedicated hardware, CDNs, google hosting. These third parties can have a significant effect on performance, delaying the load event, deferring actions, and being a single point of failure beyond your control. This deck discusses techniques and strategies for working with 3rd parties within these limitations, and shares some relevant community work.

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Third party-performance (Airbnb Nerds, Nov 2013)

  1. 1. THIRD PARTY PERFORMANCE Guy Podjarny (@guypod) CTO, Web Experience, Akamai Faster ForwardTM ©2013 Akamai
  2. 2. What’s a third party? - Not a 1st Party? - Infrastructure & code managed by someone else - What’s not a 3rd party: - Reused Software (e.g. jQuery, Apache) – premium or free Commercial Hardware (e.g. ADC, WAF) Cloud Provider (e.g. AWS) CDN (e.g. Akamai) Faster ForwardTM ©2013 Akamai
  3. 3. Where are the third parties? - A tag on the page - Analytics/trackers - invisible - Image Tags & Scripts - Non-critical page components (e.g. Share buttons, Get feedback…) - Critical Page Components (A/B Testing, Shopping Cart Personalization, Ads(?)..) - An inline Cloud proxy (e.g. MotionPoint, SiteSpect) Faster ForwardTM ©2013 Akamai
  4. 4. # Domains Per Page Sep 2013 Percentiles: - 25th : 4 domains - 50th : 10 domains - 75th : 21 domains - 90th : 36 domains Faster ForwardTM ©2013 Akamai
  5. 5. Ghostery Data - Media Faster ForwardTM ©2013 Akamai
  6. 6. Ghostery Data - Retail Faster ForwardTM ©2013 Akamai
  7. 7. 3rd Party Extravaganza! Faster ForwardTM ©2013 Akamai
  8. 8. Airbnb Home Page Faster ForwardTM ©2013 Akamai
  9. 9. Airbnb Location Page Faster ForwardTM ©2013 Akamai
  10. 10. Why Should you Care? (from a performance perspective) - Single Point of Failure – SPOF - Scripts block rendering of everything below them - Delayed load event - Users see progress indicators for longer - Other deferred actions get delayed - e.g. $.ready(myfunc) - Delayed 1st party scripts - Resource Contention - Battery Consumption (on mobile) Faster ForwardTM ©2013 Akamai
  11. 11. SPOF Home Page, Optimizely & Truste Down Business Week, Truste Down Faster ForwardTM 22 Secs 45 Secs 22 Secs ©2013 Akamai
  12. 12. SPOF – Not Only Your Homepage Category Page, BazaarVoice down Faster ForwardTM 23 Secs ©2013 Akamai
  13. 13. Airbnb.ca homepage: SPOF delays late actions Faster ForwardTM ©2013 Akamai
  14. 14. New York Page Faster ForwardTM ©2013 Akamai
  15. 15. New York Page SPOF Faster ForwardTM ©2013 Akamai
  16. 16. The 1st Party Arsenal - Async - Delay onload (async att) vs don’t delay onload (IFrame) - Defer Execution - Defer Download - Remove Tag Faster ForwardTM ©2013 Akamai
  17. 17. Analytics & Beacons - Goal: Async without delaying onload - Shouldn’t delay visible content - Defer not great since it’s likely to miss users Faster ForwardTM ©2013 Akamai
  18. 18. Beacons that don’t delay onload Faster ForwardTM ©2013 Akamai
  19. 19. Beacons that don’t delay onload Faster ForwardTM ©2013 Akamai
  20. 20. Q: Do Script-Inserted Beacon Images Delay Onload? http://stevesouders.com/cuzillion/?c0=bi1dfff2_0_f Faster ForwardTM ©2013 Akamai
  21. 21. Yes – Beacons delay onload (on most browsers) http://www.browserstack.com/screenshots/3c4be740eee4ad95af43ef0fc6a800d7a7aa7758 Beacons didn’t block onload on: - IE 7 - IE 8 Faster ForwardTM ©2013 Akamai
  22. 22. Works for Images Too! Faster ForwardTM ©2013 Akamai
  23. 23. Analytics & Beacons - Goal: Async without delaying onload - Shouldn’t delay visible content - Defer not great since it’s likely to miss users - Technique: Dynamically generated IFrame - Only works if no page manipulation is required - Catches and what can you do about them - Inline & external script relationships - Event registration Faster ForwardTM ©2013 Akamai
  24. 24. External Script Cringe… Dependent Inline Script Further Dependent External Script Further down dependent inline script Faster ForwardTM ©2013 Akamai
  25. 25. Run “inline” script at onload Slight Snag… But you catch my drift… Don’t forget this one! (combine all dependents to avoid race condition bugs) Faster ForwardTM ©2013 Akamai
  26. 26. FYI: Omniture Workarounds Faster ForwardTM ©2013 Akamai
  27. 27. Beacon API – Draft W3C Spec Faster ForwardTM ©2013 Akamai
  28. 28. Non-Critical Page Components - Goal: Defer Download - If they’re not critical, they shouldn’t content with the rest Faster ForwardTM ©2013 Akamai
  29. 29. Defer Download Example Faster ForwardTM ©2013 Akamai
  30. 30. Defer Download Example Faster ForwardTM ©2013 Akamai
  31. 31. Non-Critical Page Components - Goal: Defer Download - If they’re not critical, they shouldn’t content with the rest - Catches and what can you do about them - Event registration Inline & external script relationships document.write() Execution order Faster ForwardTM ©2013 Akamai
  32. 32. Nullify document.write() - Built into browsers (at least IE 9+, Safari, Chrome & Firefox) - Firefox even gives a nice console error… Faster ForwardTM ©2013 Akamai
  33. 33. Resource Priorities Faster ForwardTM ©2013 Akamai
  34. 34. Critical Page Components - Methodology: Async with blocking onload - Keep 3rd parties from blocking 1st party content - Delay onload as page not complete until component is loaded Faster ForwardTM ©2013 Akamai
  35. 35. Async with blocking onload Faster ForwardTM ©2013 Akamai
  36. 36. Critical Page Components - Methodology: Async with blocking onload - Keep 3rd parties from blocking 1st party content - Delay onload as page not complete until component is loaded - Catches and what can you do about them - Event registration Inline & external script relationships document.write() Execution order Faster ForwardTM ©2013 Akamai
  37. 37. Async scripts with Execution Order Faster ForwardTM ©2013 Akamai
  38. 38. Interim Summary - Analytics/Beacons – Async without delaying onload - Non-Critical Widgets – Defer Download (and Execution) - Critical Widgets – Async with delaying onload Faster ForwardTM ©2013 Akamai
  39. 39. Resource Timing Opt-In Ask Require All your 3rd Party Vendors to add this header! - Unless they give you a REALLY good privacy reason not to. Faster ForwardTM ©2013 Akamai
  40. 40. 3rd Party Checklist – Work in Progress… @bentlegen @igrigorik @bbinto @guypod Faster ForwardTM @triblondon Kyle Kinnaman ©2013 Akamai
  41. 41. Summary - 3rd Party tags are a part of our reality… - Pick your strategies: - Analytics/Beacons – Async without delaying onload - Non-Critical Widgets – Defer Download (and Execution) - Critical Widgets – Async with delaying onload - Track the Beacon & Resource Priorities Specs - Challenge your 3rd party vendors on their perf & availability Faster ForwardTM ©2013 Akamai
  42. 42. Questions? THIRD PARTY PERFORMANCE Guy Podjarny (@guypod) CTO, Web Experience, Akamai Faster ForwardTM ©2013 Akamai

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