JavaScript files containing blocking code delay page rendering. To understand the benefits of JavaScript optimization, we first have to understand the issues associated with JavaScript. JavaScript optimization is the process of improving the performance of JavaScript. Using Tools for JavaScript File Optimization.Leveraging (Plain) JavaScript for Optimization.Regular updates and optimization reviews.Caching and content delivery networks (CDNs).Dependency management and script concatenation.Optimizing JavaScript files resolves the issue of render blocking, page load time, large file size, and so on. So it’s crucial to optimize JavaScript files to ensure seamless performance. JavaScript files are vital aspects of the web application process, but website speed and user experience are critical to a website’s success.