Remove unused JavaScript

Loading a Web site is fast, but even faster loading times are probably possible. Remove unused JavaScript is one piece of advice in this case. What is Remove unused JavaScript and how do you find out about this problem? We explain it to you here!

What is Remove unused JavaScript?

Remove unused JavaScript is a recommendation that a program like Google PageSpeed Insights may give when you have your Web site’s content analyzed. Removing unused JavaScript may be a way to improve a website and make it faster.(1)

The disadvantage of redundant JavaScript on the website

When you open a Web site, as a user you don’t see what is going on at the “back end” of the Web site. This is where the loading of the complete website takes place. This goes fairly quickly, but it also happens that it takes a little longer. This is annoying to the user of a website, and chances are that the user will leave the web page for another website.

Redundant JavaScript is among the possible causes. This is a programming language that makes the Web page interactive through code. The browser checks all code on the site; including code that is not in use. This takes extra time and may cause longer loading times.

The impact of Remove unused JavaScript on SEO

Remove unused JavaScript has in possible impact on the SEO of a Web site or page. It causes the browser to check a website faster, which also makes it load faster. However, removing unused JavaScript does not guarantee a fast website: loading speed depends on many more things. (2)

My advice

Removing unused JavaScript is one of the ways you may make your Web site faster for both users and the search engine. We recommend using Google PageSpeed Insights. This program analyzes the content of your website and gives the message “Remove unused JavaScript”: based on this, you will get the necessary advice on how to handle it. Can’t figure it out? Then it’s always possible to bring in a developer or programmer to pick this up for you.

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.

General

• What is the website speed
• Website speed: The division between marketing and development
• Website speed: The division between marketing and development
• The influence of SEO on UX
• The influence of web design on SEO
• SPAs and SEO
• What are the Google Core Web Vitals?

Tools

• Autoptimize
• Pagespeed.Compare
• W3 Total Cache
• Tools Pingdom
• Google Pagespeed Insights
• GTMetrix

Verbter points for speed

• First Contentful Paint (FCP)
• Time To First Byte (TTFB).
• Time To Interactive (TTI).
• Image for Largest view with content (LCP) preloaded
• Enable text compression
• Reduce the CSS
• Total Blocking Time (TBT).
• Speed Index
• Reduce JavaScript
• Largest Contentful Paint
• Avoid an overly large DOM
• Delete unused CSS
• Deliver images in modern layouts
• Connect in advance to required origins
• Preventing obsolete JavaScript from being delivered to modern browsers
• Use an efficient cache policy for static items
• Remove duplicate modules from JavaScript
• Avoid multiple redirects
• Encode images efficiently
• Use lazy loading
• Load important requests in advance

General tips

• Tips for quickly loading a video
• Using Edge SEO for a faster website
• Installing a Content Delivery Network for SEO
• Optimizing images for SEO
• The influence of hosting on SEO