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It’s Easy To Measure Performance In Ember Jordan Hawker 2018

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JordanHawker elwayman02 jhawk.co/TwitchJobs

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Performance @ Twitch •  Poor performance impacts business metrics •  Backend instrumentation highlights multiple opportunities •  How can we understand the real user experience?

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Web Application Performance It’s Complicated… •  What does that even mean? •  Response Time •  Throughput •  Availability •  Responsiveness •  Rate of Requests •  Resource Consumption •  Efficiency •  Latency Photo by Denys Nevozhai on Unsplash

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Interactivity User-Perceived Performance Photo by Elena Taranenko on Unsplash

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Measuring Performance

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Measuring Performance

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Measuring Performance Lighthouse

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Instrumenting Ember •  Framework internals allow for greater granularity •  @ember/instrumentation •  subscribe(‘render’) •  Can we approximate this without introducing overhead? •  Enter Ember’s runloop…

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Taking A Closer Look

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Route Lifecycle What’s This? SOURCE | GitHub: Ember-Interactivity

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Custom Interactivity SOURCE | Twitch Internal Code

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Component Lifecycle SOURCE | GitHub: Ember-Interactivity

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Component Interactivity SOURCE | Twitch Internal Code & GitHub: Jordan-Hawker

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Component Interactivity SOURCE | Twitch Internal Code & GitHub: Jordan-Hawker

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Metrics Integration SOURCE | GitHub: Jordan-Hawker

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Developer Tooling

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Developer Tooling

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Use in Third-Party Tools

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Ember Interactivity ember-interactivity.jhawk.co

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What We Learned •  Define the critical path •  Defer non-critical components •  Identify bottleneck components •  Holistic user-centric metrics will reflect improvements across the entire tech stack Photo by _HealthMond . on Unsplash

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The Path Forward •  Leverage multiple tools for instrumentation and measurement •  Capture real user metrics •  Use framework-aware tools for more granular data •  Ember-Interactivity •  Ember-Perf / Ember-Perf-Handlebars •  Ember-Perf-Timeline What Can You Do? Photo by Geran de Klerk on Unsplash

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You Don’t Know What To Optimize If You Can’t Measure It

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Thank You! JordanHawker elwayman02 www.JordanHawker.com jhawk.co/embersv-interactivity