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Discover the Basics of Lightning UI Performance Testing
Learn how to measure Lightning Platform UI performance, write and automate tests, and collect performance metrics, following best practices for performance testing.
Important: This session is first come, first seated. You do not have a reserved seat.

, Founder/Architect, Grandstand Performance

Role: Architect, Developer
Product: Agentforce 360 Platform
Session Level: Beginner
Session Type: Theater
  • Tuesday, Sep 174:00 PM - 4:20 PM PDT
    (11:00 PM - 11:20 PM GMT)
    Moscone West, L1 Forest, Developer Theater
Session Summary by Einstein: The session provided an in-depth exploration of performance testing within single-page applications (SPAs), highlighting the nuances between SPAs and traditional websites in terms of page loading and rendering. The speaker emphasized Salesforce's creation of a custom metric, Experience Page Time (EPT), to measure page load times in the absence of standard web vitals for SPAs. Through live coding demonstrations, attendees were shown how to capture EPT data, and the significance of using median over mean in performance data analysis was underscored, noting that a consistent low standard deviation is ideal for identifying performance issues. The session concluded with recommendations on setting performance goals, assessing real user metrics, and strategies to reduce variance in performance testing.
Key Takeaways by Einstein:

• Salesforce developed its own metric, EPT, to measure page load times for SPAs due to the lack of standard performance metrics in such applications.

• Median is preferred over mean for analyzing performance test results to minimize the impact of outliers and obtain a more accurate representation of page load times.

• Best practices for performance testing include running multiple iterations on a clean machine and aiming for a standard deviation below 30 milliseconds to reliably identify performance issues.

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Salesforce Developer, IBM