Speed up your website with all new javascript optimization tactics

Speed up your website with all new javascript optimization tactics

What is Javascript?

JavaScript is a scripting language for creating dynamically updated material, controlling multimedia, animating pictures, and pretty much anything else. In another word JavaScript is a scripting or programming language that allows you to implement complex features on web pages — every time a web page does more than just sit there and display static information for you to look at — displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. — you can bet that JavaScript is probably involved. It is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we have covered in much more detail in other parts of the Learning Area

Common problems of JavaScript

First of all fixing, any problem needs to know the source of the issue. Here I point out a few common JavaScript performance problems

The Dom (Document Object Model) plays the most solid role in the interactivity of the website’s host. Every interaction with the host rather it is a simple object or user browser it increases the performance lag. You obviously can’t avoid the interactions but you can keep it to a minimum number. So, in that case, blocking the Dom can short out the issues very well. The Dom It’s a programming interface for HTML and XML documents that define how they can be read and altered using scripting languages like JavaScript.

Non-critical JavaScript

JavaScript that isn’t required for content above the fold but can be used on the page or on other pages

The red one is a non-critical JavaScript style that applies to content not immediately visible; code not being used in the page’s core functionality.

The Rest other color defines Styles that are required for first paint; code that’s critical to the page’s core functionality

Dead JavaScript:

Dead JavaScript refers to code that isn’t used at all anymore. It may contain remnants from previous versions of your site, and/or imported from other modules that aren’t referenced anymore, and/or used to be a part of testing (i.e., they were used temporarily).

How JavaScript issues affect page performance:

JavaScript is the main reason that we are able to get the information and engage through Social media platforms and offers a dynamic website experience instead of just plain old text and images. So, a large scale of java scripts can make website loading time higher for that reason website users experienced can get harm and the rank of the website can go down and the bounce rate can be increased and CTR can be gone down.

For example an unused JavaScript increase browser execution and render time and slow down the page load

According to the HTTP archive, the average desktop webpage weighs 2123.6KB, while the average mobile webpage weighs 1917.5KB. JavaScript accounts for 475KB of that weight on desktop, and 440KB on mobile. These figures are up 28.8% for desktop and 25.8% on mobile since 2018. The language offers the ability to collect important info and provide an engaging user experience but is too often implemented with little regard for performance cost. Since it’s a major cause of website performance issues, we consider JavaScript to be one of the best places to start when looking for ways to speed up your website. 

Tips for optimizing JavaScript:

Crawl your website in any website crawler to locate your JavaScript issues there you can find many kinds of JavaScript issues like “Reduce Unused JavaScript”, “Minify JavaScript” etc. For the best performance need to optimize the js files, here are few tips to optimize the JavaScript files to make the website loading time better.


This method allows you to split your code into various which can be loaded on demand. It can be used to achieve smaller bundles and regulate resource load prioritization, both of which can have a significant impact on load time if utilized appropriately.

Tree shaking:

Tree shaking is a term commonly used in the JavaScript context for dead-code elimination it releases on static module structure.

Dead imported code elimination:

Dead code is frequently imported from popular libraries or other JavaScript bundles, making it difficult to import code specifically for your application. There are various of types of plugins available to fix the issues.