Jonas Kröger
Frontend Performance Testing in practice
#1about 5 minutes
Why frontend performance is crucial for business and users
Poor performance negatively impacts users with slow internet or low-end devices and directly harms business revenue and signups.
#2about 3 minutes
Understanding key frontend performance metrics and KPIs
Key performance indicators like Time to Interactive and First Contentful Paint translate technical measurements into the perceived user experience.
#3about 2 minutes
Setting aggressive goals for key performance metrics
Establish clear, aggressive targets for metrics like JavaScript bundle size and Time to Interactive to guide optimization efforts.
#4about 3 minutes
An overview of proactive, reactive, and passive testing
Performance testing can be categorized into proactive (during development), reactive (in CI/CD), and passive (continuous monitoring) approaches.
#5about 5 minutes
Proactive testing with dev tools and bundle analyzers
Use browser dev tools for network throttling and tools like Webpack Bundle Analyzer to identify large dependencies during local development.
#6about 11 minutes
Automating reactive performance testing in your CI/CD pipeline
Integrate automated Lighthouse and WebPageTest runs into your CI/CD pipeline to track performance KPIs and enforce budgets on every build.
#7about 3 minutes
Using passive testing for continuous real-user monitoring
Employ external services like New Relic or Calibre to continuously monitor live site performance and gather real-user data over time.
#8about 3 minutes
Key takeaways for building a strong performance culture
Building a performance-focused culture relies on collecting data, automating everything, and fostering developer empathy through practices like "2G Tuesdays".
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Matching moments
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Improving the developer feedback loop with specialized tools
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Why you might not need JavaScript for everything
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How a broken frontend culture impacts the web
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Ensuring accurate testing across different browsers and devices
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Exploring modern JavaScript performance and new CSS features
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The value of progressive enhancement and semantic HTML
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The origin story of the Polypane developer browser
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