Learn how to replace complex scroll listeners and getBoundingClientRect calculations with the modern Intersection Observer API, using just ten lines of JavaScript to create a clean, high‑performance lazy‑loading solution that swaps placeholder images for real content and even supports preloading via rootMargin.
This article explains how the react-virtualized-list library combined with the Intersection Observer API can dramatically improve rendering performance for large data sets, achieving up to 95% faster page loads and smoother infinite scrolling on both PC and mobile browsers.
This article explains how virtual scrolling can dramatically improve the performance of large online document editors by rendering only visible content, discusses various implementation strategies such as progressive pagination, canvas rendering, line‑ and block‑level virtualization, and details state management, view‑locking, fast‑scroll handling, and integration scenarios like anchor navigation, find‑replace, and comment systems, while providing code examples and performance test results.
This article introduces front‑end lazy‑loading strategies—including route lazy loading, three image lazy‑loading methods (native, scroll‑event, and IntersectionObserver), and module lazy loading—explaining their principles, showing complete React/Vue code examples, and demonstrating how they reduce initial load time and improve user experience.
This article explains how to improve performance of long React pages by rendering components screen‑by‑screen using viewport detection (getBoundingClientRect or Intersection Observer), grouping data, debouncing scroll handlers, and applying React.memo to prevent duplicate data requests.
This article presents an in‑depth front‑end performance checklist covering transfer optimizations, script loading strategies, IntersectionObserver lazy loading, critical CSS inlining, resource hints, service‑worker caching, connection‑aware components, and techniques to prevent layout shifts and improve rendering speed.
