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How to defer parsing of JavaScript in WordPress?

When WordPress websites have profound benefits, they are fast loading. It will enhance the user experience for visitors, improve the website’s visibility on the search engine, and even increase the site and its organic traffic. A web page will contain HTML, JavaScript, images and CSS, and all have optimization to reduce the page load time. The photos have the most significant effects on page size. It is essential to reduce the file sizes of images by using WordPress, image optimization, and the plugin.

What is the meaning of defer parsing?

It means you can advise the browsers and then load the page content and images before JavaScript and the perfect load. Take the measures, which means that JavaScript elements like the sliders and the forms will take a few seconds with an extra load, but you can pay the small price as the page loading, and there is a significant improvement.

One can execute the JavaScript code and achieve it later with two techniques: Defer and Async. One can support both methods with the popular though dedicated solutions and give a little more control, and the JavaScript files are loaded with the latter.

The article will explain the definite benefits you want to defer with loading the JavaScript files and show you the five helpful WordPress plugins that will simplify the exact process. Through this entire article, you will know the best and work on the same.

Types of ways to defer parsing of JavaScript in WordPress

JavaScript is a vital block building in WordPress websites that one can use to display buttons, media, forms, audits, videos, galleries, social media timelines and even more. JavaScript is also why the web page flows because the browser needs to stop, download, and execute each script before you can even continue parsing the page’s HTML markup.

Now parsing is the perfect process where the browser will analyze and even convert to the page code and format you can execute. There is any code which will stop the function from calling render blocking, as you can delay the rendering process with the visitors’ page. There are render block resources, which is why the WordPress website will load slowly. There is critical CSS that one can display in line with render-blocking prevention. Still, please defer with JavaScript loading and later use the Async and Defer to prevent JavaScript code and block the page rendering.

It is even a good practice to remove the unused code of JavaScript and even reduce the execution time of JavaScript. You can reduce the large JavaScript size and the files with the Minification process, which will remove the unnecessary white space code from the different JavaScript files. There is an essential metrics on which the website is benchmarking services like the Google PageSpeed I sights and the GTmetrix to consider in the First Contentful Paint. It is time it takes for the effective first content to get the display and visitors. Google states that FCP time is from 0-1.8 seconds which is good. If there is anything above three seconds, then it will be slow.

You must enter the website page’s URL, which offers the benchmarking service, to see the CSS files and JavaScript. It will block the page render, and they take seconds to download so that you can eliminate the resources, and the page will load fast. One can easily use Async and defer attributes to stop the render blocking of the JavaScript files. They are Boolean attributes, and one can only operate with an HTML script element when the SRC attribute calls the external files.

Async JavaScript File

When the expert adds an HTML script element with the defer of Async attribute, you will advise the browser to download the file with the same page in the parsed form. With the file defer, one can e execute as soon as the page becomes parsed entirely. In contrast, the Async attribute with the asynchronous operation will execute the file, and you can download it with the same. The exact time to page parse with the Async will become slightly higher, but a browser will briefly stop HTML parsing from executing the files.

There is a necessary standard to understand that there is Document Object Model, and you can frequently refer as DOM. It represents the entire document, like the XML file and the HTML page, as the perfect single object. There are essential elements such as the head, headers, and body, and one can consider the branch.

If the JavaScript file will not require the information from another file or DOzm itself, then it is worth using the Async method as the page’s essential element to display quickly. You need to be aware that the Async will cause an error with the website if the request information files have not yet been loaded.

If a JavaScript file requires information, then you will get the preferred option as it ensures all the contents you retrieve are in the correct form before one file Iain execution. There is a goal of waiting, and Async is the blocking page reduced to render, and you can see the significant improvements in the loading times on the page and whichever method you can use.

How does defer parsing use a plugin in WordPress

There is a JavaScript call on the website, and it will come from the WordPress theme and even activate WordPress plugins. It is impractical to the manual to add the defer, and even Async attributes to the script elements. It is ideally better to get used to WordPress plugin performance to defer parsing of the JavaScript in WordPress and then simplify the application process to defer or the Async through the website.

It will help if you are mindful of the exact fact and if the wrong configuration setting will cause problems with the website design. For example, the contact forms will display the correct form unless you choose the proper configuration, and the settings seven exclude the contact form with files from the different optimization.


JavaScript will continue to be the preferred dynamic content method and even offer interactive elements to websites. One can use them and reduce the page rendering blocking finally. There will be functionality to apply to defer, and the Async in the many WordPress plugins and the solutions reference will offer more control over the JavaScript files. Test the WordPress plugins and defer with JavaScript parsing and even the performance of multiple tests to ensure you have the best configuration.

Warren Wesley Author

Prashant Pujara is the founder and CEO of MultiQoS Technologies, a well-known WordPress Development Company in India that specializes in Android and iOS Mobile Applications. He has more than 10 years of app development expertise, with a particular focus on web development in Angular and Golang technologies.