Javascripts

Effective JavaScript Bundle Optimization: Reducing the No-Interactivity Gap

• Goal of Bundle Optimization:
  The primary objective of investigating and reducing JavaScript bundle size is to minimize the “no interactivity gap,” which is the time when pre-rendered content is visible but the page remains unresponsive because the necessary JavaScript has not yet been downloaded and executed.

• Analyzing Bundle Contents:
  To begin the investigation, developers must use bundle analyzers (such as Rollup Plugin Visualizer). These tools visualize the bundle as a hierarchical graph (treemap or flame graph), allowing the identification of unreasonably large areas, often pointing to specific libraries.