Remove duplicate modules from JavaScript bundles

Making a website faster? There are numerous options for this, including removing duplicate modules from JavaScript bundles. What is Removing duplicate modules from JavaScript bundles and how exactly does it work? Here we explain this to you.

What is Removing duplicate modules from JavaScript bundles?

Removing duplicate modules from JavaScript bundles is advice you may get when analyzing your Web site. Google Lighthouse is one of the programs that gives you this advice. It makes your website load faster.

The operation of JavaScript modules

JavaScript bundles on Web pages are made up of bits of code and files from popular libraries. This potentially causes a page to copy duplicate modules from multiple sources.

Removing duplicate modules in JavaScript bundles ensures that you are not sending unnecessary JavaScript code to visitors when they load the Web site. The lower the payload delivered, the faster the browser loads a page. Thus, removing duplicate modules may provide faster loading times.

The impact of Removing duplicate modules from JavaScript bundles on SEO

Removing duplicate modules from JavaScript bundles potentially impacts the SEO of a website or page. This ensures that the browser loads your website faster. This is attractive to the visitor, but at least as attractive to the search engine. A search engine such as Google pays more and more attention to the speed of a page: therefore, this modification may provide a higher position in search results. On the other hand, it is also important to note that this is not the only way to improve website speed.

My advice

Speeding up a Web site is possible in several ways. The advice Remove duplicate modules from JavaScript bundles is one of many you can follow. We recommend having a comprehensive website analysis done, for example, at Lighthouse or Google PageSpeed Insights. This will give you a clear picture of possible bottlenecks to the website that deserve your attention.

The most complete book on website speed

I’ve written so much about speeding up websites and everything involved that I like to divide it into different sections; general, tools, speed improvement points and tips. Feel free to see and consult all the links below to learn more about tools and tips for speeding up your website.



Verbter points for speed

General tips

Frequently Asked Questions

What does “Remove Duplicate Modules From Javascript Bundles” mean?

When analyzing your website using a tool such as Google Lighthouse, for example, you get all kinds of advice on how to improve your site. One may be the advice “Remove duplicate modules from JavaScript bundles.” It is advisable to follow up as this will result in your site loading faster.

What is the impact of Removing Duplicate Modules From Javascript Bundles on SEO?

Optimizing your site and making it faster ensures satisfied users. Google also looks at a website’s loading speed. The better it is, the higher its ranking in search results. This, in turn, will lead to more traffic to your site and improve your results.

Senior SEO-specialist

Ralf van Veen

Senior SEO-specialist
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I have been working for 10 years as an independent SEO specialist for companies (in the Netherlands and abroad) that want to rank higher in Google in a sustainable manner. During this period I have consulted A-brands, set up large-scale international SEO campaigns and coached global development teams in the field of search engine optimization.

With this broad experience within SEO, I have developed the SEO course and helped hundreds of companies with improved findability in Google in a sustainable and transparent way. For this you can consult my portfolio, references and collaborations.

This article was originally published on 22 March 2024. The last update of this article was on 22 March 2024. The content of this page was written and approved by Ralf van Veen. Learn more about the creation of my articles in my editorial guidelines.