Links on Performance II

Here are a couple of noteworthy performance-related links I wanted to share.

Puppeteer: A Recipe Book for Web Performance Testing

Puppeteer, a Node.js library, allows headless Chrome control for tasks like website screenshots and integration tests. It's even Lambda-compatible! A less-known application is synthetic performance testing, particularly useful for Web Core Vitals.

Addy Osmani provides a collection of Puppeteer "recipes" for measuring various performance aspects. Integrating these into your build process alongside unit, integration, and accessibility tests ensures comprehensive quality control.

BrowserStack SpeedLab: A Quick Performance Overview

BrowserStack's SpeedLab offers rapid website performance scoring. Its speed is beneficial for initiating performance improvement discussions within teams.

However, the scoring methodology lacks transparency, seemingly relying on metrics like TTFB and page load events, which aren't ideal for in-depth performance analysis. While useful for initial assessments, it's not a tool for experienced performance engineers.

Common Performance Monitoring Pitfalls

Karolina Szczur from Calibre highlights common team challenges in performance monitoring, such as distinguishing genuine issues from random fluctuations. Her article emphasizes the importance of understanding meaningful performance changes to avoid false positives and wasted investigation time.

Long JavaScript Tasks: A User Experience Killer

JavaScript tasks exceeding 50ms negatively impact user experience. Prolonged main thread CPU usage leads to delayed clicks, sluggish scrolling, increased battery drain, and ultimately, user frustration and abandonment. Tracking and addressing these long tasks is crucial.

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