Remove Duplicate Modules in JavaScript Bundles

What are JavaScript Bundles?

Another JavaScript optimization to consider is removing any duplicate modules in bundles. While JavaScript frameworks can provide web developers with pre-defined bundles or packages, this can end up causing performance issues that may be out of your control. Sometimes, duplicate, or similar JavaScript code can find its way into your modules during development or within WordPress plugins, for example. Again, the more JavaScript involved, you increase the time the browser must process, which creates increases the time required to process. All of this affects the end user’s experience, and they are left waiting longer for the page to load. One of the ways to avoid this from happening is to ensure that there are best practices in place during the development process. It is often more time-consuming and harder to identify after this code is put into production environments.



Lighthouse is an open-source tool that is used to run an audit against your web pages and provides scores and suggestions for improving page performance, accessibility, SEO, and more.


PageSpeed Terms

PageSpeed Insights is a tool created by Google that reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.



YSlow is an open-source website analysis tool that can be used to identify web page performance issues. Learn more about the YSlow to enhance your web pages and the user experience.