How To Defer Parsing of JavaScript in WordPress

when it comes to websites speed is everything.

It’s like that old saying “time is money” but in this case slow websites mean lost customers and a frustrated audience.

Now a lot of people tell you to defer parsing of JavaScript but sometimes the advice can feel like a blurry instruction.

It’s like being told to change a tire without knowing how to take the lug nuts off!

Let’s break it down shall we?

🚀 Want to make your website blazing fast? ⚡️ Deferring JavaScript is like giving your site a turbo boost. It’s super easy! Learn how to defer JavaScript for a faster website

Understanding the Need for Deferring JavaScript

🚀 Want to make your website blazing fast? ⚡️ Deferring JavaScript is like giving your site a turbo boost. It’s super easy! Learn how to defer JavaScript for a faster website

Imagine your website is a bustling street market.

You’ve got vendors setting up customers browsing and lots of activity.

JavaScript is like a team of workers setting up their stalls and making sure everything’s ready to go.

But they can be a bit slow sometimes taking up valuable space and holding back the rest of the market.

This is exactly what happens when your browser downloads and executes JavaScript files.

It can interrupt the loading of other website content making your site feel sluggish and causing visitors to click away.

That’s why deferring JavaScript parsing is so important.

Methods for Deferring JavaScript

There are two main approaches to deferring JavaScript parsing: manual editing and plugins.

Manual Editing: Taking the Wheel

This method is like rolling up your sleeves and doing the work yourself.

It’s powerful but it requires a bit more technical knowledge.

Diving into the Code

You’ll be working with your website’s functions.php file which is the heart of your WordPress theme’s functionality.

It’s like the master control panel and changing it incorrectly could have unintended consequences.

So as with any car repair it’s a good idea to back up your site first!

Here’s a step-by-step guide to manual editing keeping in mind that it’s crucial to test your website thoroughly after making changes:

1. Login to your WordPress dashboard: This is your command center where you manage everything about your website.
2. Navigate to Appearance > Theme Editor: Think of this as the garage where you can access the engine of your theme.
3. Locate functions.php: It’s like the instruction manual and you’ll find it under the Theme Files section.
4. Add the code: Scroll to the bottom of the functions.php file and paste in this code:

function defer_parsing_of_js( $url ) {
    if ( FALSE === strpos( $url '.js' ) ) return $url; 
    if ( strpos( $url 'jquery.js' ) ) return $url; 
    return str_replace( ' src=' ' defer src=' $url );
}
add_filter( 'script_loader_tag' 'defer_parsing_of_js' 10 ); 

This code tells the browser to wait until all the other content is loaded before starting to download and run your JavaScript files.

5. Update the file: Click the “Update File” button and you’ve just given your website a performance boost!

Targetting Specific Scripts

Now remember that not all JavaScript files are created equal.

Some are essential for your website’s core functionality while others might be extras that can be loaded later.

For example you might have a script that handles animations or social sharing buttons.

These aren’t essential to the main content of your website and can be deferred.

You can modify the code above to specifically target these files ensuring your site runs smoothly without delays.

Plugins: Taking the Easy Route

If you’re not comfortable with manual editing don’t worry! There are plugins that can handle the job for you much like a skilled mechanic taking care of your car.

Top Plugin Options:

Here are three popular options for deferring JavaScript parsing with a plugin:

1. WP Rocket: It’s a premium plugin that offers a wide range of performance optimization features including deferring JavaScript and lazy loading images. It’s like a full-service garage for your website.

   • Pros:
     • Comprehensive set of optimization tools.
     • Excellent performance improvements.
     • Great support.
   • Cons:
     • Paid plugin.

2. Autoptimize: This plugin is free and offers a simpler approach to optimizing your website including deferring JavaScript.

   • Pros:
     • Free and easy to use.
     • Good basic optimizations.
   • Cons:
     • Not as feature-rich as some premium options.

3. Speed Booster Pack: A free plugin that offers a variety of performance enhancements including deferring JavaScript lazy loading and minifying code.

   • Pros:
     • Free and user-friendly.
     • A good mix of basic and advanced features.
   • Cons:
     • May not be as powerful as premium plugins.

Using Plugins:

Here’s a typical workflow for using plugins to defer JavaScript:

1. Install and activate the plugin: In your WordPress dashboard navigate to Plugins > Add New search for the plugin you want click “Install Now” then activate it.
2. Configure the settings: Plugins typically have dedicated settings pages. For Speed Booster Pack for example you would go to Speed Booster > Advanced and enable the “Defer parsing of JS files” option.
3. Save your changes and test: Save the settings and then check your website’s speed using tools like Google PageSpeed Insights or GTmetrix.

Choosing the Right Approach:

Deciding between manual editing and plugins is a matter of preference and technical skill.

If you’re comfortable with code and have a deeper understanding of how your website works manual editing can give you more control.

But if you prefer a simpler more automated approach plugins are a great option.

The Impact of Deferring JavaScript:

Imagine your website visitors browsing through your online store.

They see beautiful product images engaging descriptions and attractive call-to-action buttons.

All of this happens quickly thanks to deferring JavaScript.

That’s the beauty of deferring JavaScript! It can improve:

• Page Load Times: Faster website speed means happier visitors. They don’t have to wait around for your website to catch up.
• User Experience: Deferring JavaScript ensures that the essential content of your website is loaded first so users see what they’re looking for right away.
• Bounce Rate: If your website is slow visitors are more likely to leave before they’ve even had a chance to explore. Deferring JavaScript helps to keep them engaged and coming back for more.
• SEO Rankings: Google favors websites that load quickly and deferring JavaScript can help you improve your search engine rankings.

Beyond Deferring JavaScript:

Deferring JavaScript is just one piece of the puzzle when it comes to optimizing your website’s performance.

Here are a few other things you can consider:

• Minifying Code: Like cleaning out a cluttered closet minifying code removes unnecessary characters and whitespace making your website smaller and faster to load.
• Image Optimization: Heavy images can slow down your website. Compressing and resizing images can make a significant difference.
• Caching: Caching is like having a pre-made meal ready to go when a customer orders. It stores copies of your website’s content so it doesn’t have to be recreated every time someone visits.
• Content Delivery Networks (CDNs): CDNs are like having warehouses strategically placed around the world ensuring fast delivery of your website’s content to visitors no matter where they are.

Wrap-up:

Remember website optimization is a marathon not a sprint.

Take the time to implement these techniques and you’ll see the benefits in a smoother faster and more enjoyable online experience for your visitors.

It’s all about creating a welcoming and engaging environment for your users just like having a friendly helpful team at your bustling street market.

🚀 Want to make your website blazing fast? ⚡️ Deferring JavaScript is like giving your site a turbo boost. It’s super easy! Learn how to defer JavaScript for a faster website