Third party-performance (Airbnb Nerds, Nov 2013)
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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 ...

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) Third party-performance (Airbnb Nerds, Nov 2013) Presentation Transcript

  • THIRD PARTY PERFORMANCE Guy Podjarny (@guypod) CTO, Web Experience, Akamai Faster ForwardTM ©2013 Akamai
  • 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
  • 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
  • # Domains Per Page Sep 2013 Percentiles: - 25th : 4 domains - 50th : 10 domains - 75th : 21 domains - 90th : 36 domains Faster ForwardTM ©2013 Akamai
  • Ghostery Data - Media Faster ForwardTM ©2013 Akamai
  • Ghostery Data - Retail Faster ForwardTM ©2013 Akamai
  • 3rd Party Extravaganza! Faster ForwardTM ©2013 Akamai
  • Airbnb Home Page Faster ForwardTM ©2013 Akamai
  • Airbnb Location Page Faster ForwardTM ©2013 Akamai
  • 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
  • SPOF Home Page, Optimizely & Truste Down Business Week, Truste Down Faster ForwardTM 22 Secs 45 Secs 22 Secs ©2013 Akamai
  • SPOF – Not Only Your Homepage Category Page, BazaarVoice down Faster ForwardTM 23 Secs ©2013 Akamai
  • Airbnb.ca homepage: SPOF delays late actions Faster ForwardTM ©2013 Akamai
  • New York Page Faster ForwardTM ©2013 Akamai
  • New York Page SPOF Faster ForwardTM ©2013 Akamai
  • 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
  • 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
  • Beacons that don’t delay onload Faster ForwardTM ©2013 Akamai
  • Beacons that don’t delay onload Faster ForwardTM ©2013 Akamai
  • Q: Do Script-Inserted Beacon Images Delay Onload? http://stevesouders.com/cuzillion/?c0=bi1dfff2_0_f Faster ForwardTM ©2013 Akamai
  • 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
  • Works for Images Too! Faster ForwardTM ©2013 Akamai
  • 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
  • External Script Cringe… Dependent Inline Script Further Dependent External Script Further down dependent inline script Faster ForwardTM ©2013 Akamai
  • 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
  • FYI: Omniture Workarounds Faster ForwardTM ©2013 Akamai
  • Beacon API – Draft W3C Spec Faster ForwardTM ©2013 Akamai
  • Non-Critical Page Components - Goal: Defer Download - If they’re not critical, they shouldn’t content with the rest Faster ForwardTM ©2013 Akamai
  • Defer Download Example Faster ForwardTM ©2013 Akamai
  • Defer Download Example Faster ForwardTM ©2013 Akamai
  • 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
  • Nullify document.write() - Built into browsers (at least IE 9+, Safari, Chrome & Firefox) - Firefox even gives a nice console error… Faster ForwardTM ©2013 Akamai
  • Resource Priorities Faster ForwardTM ©2013 Akamai
  • 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
  • Async with blocking onload Faster ForwardTM ©2013 Akamai
  • 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
  • Async scripts with Execution Order Faster ForwardTM ©2013 Akamai
  • 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
  • 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
  • 3rd Party Checklist – Work in Progress… @bentlegen @igrigorik @bbinto @guypod Faster ForwardTM @triblondon Kyle Kinnaman ©2013 Akamai
  • 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
  • Questions? THIRD PARTY PERFORMANCE Guy Podjarny (@guypod) CTO, Web Experience, Akamai Faster ForwardTM ©2013 Akamai