JavaScript Performance Patterns Table of Contents - When to Use - Instructions - Details - Source Runtime performance micro-patterns for JavaScript hot paths. These patterns matter most in tight loops, frequent callbacks (scroll, resize, animation frames), and data-heavy operations. They apply to any JavaScript environment — React, Vue, vanilla, Node.js. When to Use Reference these patterns when: - Profiling reveals a hot function or tight loop - Processing large datasets (1,000+ items) - Handling high-frequency events (scroll, mousemove, resize) - Optimizing build-time or server-side scripts…