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The iPhone Performance Illusion: A Stark Reality Check for Web Developers

2025-01-09

This article exposes a significant performance gap in mobile web applications. Using data from Rum Archive, the author compares UK iOS and Android users' web page loading speeds, revealing Android users experience 34% slower First Contentful Paint (FCP) and a staggering 66% slower Time To Interactive (TTI). Analyzing the correlation between GeekBench CPU scores and Interaction to Next Paint (INP), the author shows that low-end Android devices exhibit significantly higher INP times than high-end devices, with even older iPhones outperforming the latest top-tier Android phones. The author stresses that the large Android user base shouldn't be ignored; neglecting their experience leads to lost opportunities. The article urges developers to understand user device diversity, use RUM tools to gain insights into real-world conditions, and simulate low-end devices during development and testing to create more inclusive web apps.

Breaking Up with Long Tasks: Mastering Asynchronous Loops for Web Performance

2025-01-04

This article delves into optimizing JavaScript loops to prevent blocking the main thread and improve web performance. The author highlights that using `for...of` loops or methods like `forEach` directly on large arrays can create long tasks, leading to a sluggish user experience. The solution involves using `scheduler.yield` or `setTimeout(0)` with `async/await` to break down long tasks into smaller ones, yielding control after each iteration to maintain responsiveness. The article further explores batch processing and frame rate optimization strategies to balance responsiveness and processing efficiency. Ultimately, it recommends choosing an appropriate batch size and strategy based on specific application needs for optimal user experience.