Replace Large JavaScript Libraries with Smaller Alternatives

How JavaScript Bundles Affect Website Performance

Another Lighthouse warning may appear if your JavaScript bundles are unnecessarily too large. Large JavaScript bundles will increase the time the browser needs to download, parse, and process JavaScript files. Instead, developers should try to reduce the size of JavaScript files but try to maintain the core functionality. Many older JavaScript packages and frameworks contain pre-defined dependencies and files that are not necessarily needed. While it may provide developers with an easier and quicker way to develop applications, it can cause your JavaScript libraries to be bloated and decrease performance. One method to avoid this from happening is to select libraries that are better suited for your applications. Additionally, reviewing the required dependencies and using only the ones required. This may be a time-consuming task, but it will load better and provide users with better overall experience.



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.