How to Reduce JavaScript Execution Time on Shopify: A Step-by-Step Guide

*How to Reduce Javascript Execution Time on Shopify: A Step-by-step Guide
Image credit: Cristina Morillo

Top Tips to Reduce JavaScript Execution Time on Shopify

Are you experiencing slow site loading on your Shopify store? Wondering what could be wrong? It’s not only annoying, but it can cause prospective customers to leave your store because they can’t quickly drop items into their shopping cart on time. Even worse, they could get stuck at the payment gateway! Then you need to speed up loading time as well as enhance site responsiveness. Concerning this, have you ever wondered how to reduce JavaScript execution time Shopify?

JavaScript is one programming language that’s crucial for effective search engine optimisation. It also contributes to rapid page speed and excellent site performance for your Shopify store.

This article will show the step-by-step guide on how to reduce JavaScript execution time on Shopify and increase active and successful sales closing.

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What Is JavaScript? 

*How to Reduce Javascript Execution Time on Shopify: A Step-by-step Guide
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Knowing JavaScript shouldn’t be limited to techy people, but website owners and active users too. In one way or the other, these people come in touch with JavaScript language both on the front end and backend. As such, the basic knowledge of JavaScript is necessary. 

JavaScript is a scripting or programming language which enables users to execute complex aspects and details of web pages, making them interactive. In other words, JavaScript provides web pages with interactive components that communicate with a user. 

As such, every time a web page responds, it updates minute by minute, gives real-time information and reloads to provide the information you commanded. That’s basically what JavaScript does.

Famous examples of JavaScript-based services you probably use are Amazon and Shopify search boxes. Your Twitter feed is also an excellent example of a JavaScript-based platform.

Even though it’s the primary web development language, JavaScript doesn’t work alone when developing interactive web pages. It goes hand-in-hand with HTML and CSS. Like a three-tiered cake, JavaScript is the third layer of conventional web technologies. 

While HTML is the mark-up language used to give structure and significance to your web content by adding headings, paragraphs, images, etc., CSS is a language used to apply styles such as background colours, fonts and columns.

JavaScript coding allows you to develop unique content, animation and many other multimedia materials. It works together with the different coding languages (HTML and CSS).

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Just How Vital Is JavaScript?

JavaScript is not just a coding language; at its finished stage, it has visible functions, including:

1. Aiding Web Page Responsiveness 

With JavaScript, you can have unrestricted use of a web page because it aids active interaction. It also allows you to manoeuvre through different website sections. 

Other things you can do under this function are:

  • Ability to reveal and hide detailed information behind a clickable button.
  • Switching colours for a particular button when you place your mouse over it.
  • Capacity to scroll through numerous images on the homepage.
  • Zoom in or zoom out on an image.
  • Ability to display time in real-time or create a count-down display on a website.
  • Playing audio and video files on a web page.
  • Provision for including animations.
  • Ability to use a drop-down hamburger function.

2. Allows You to Create Both Web and Mobile Apps

JavaScript frameworks for building web and mobile applications comprise JavaScript code libraries. These give developers pre-written code to implement routine programming tasks and features in their web or mobile app.  

Common examples of JavaScript front-end frameworks are Angular, React, Vue,Node.js and React Native. 

3. Development of Web Servers and Server Applications

You can also use JavaScript to build a simple web server and develop its backend features with Node.js.

4. The Building of Gaming Programs 

Gaming programs
Image credit: Kevin Ku

Developing browser games with JavaScript is an excellent option for beginners learning JavaScript or people who want to take a crash course in programming

 Apart from all these other JavaScript purposes, it is the only default programming language for the web browser. Even more, it is fun to learn, great for web development beginners and the most popular web program language.

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What Is Shopify? 

Shopify, Inc. is an e-commerce platform where you can sell your products. It allows you to create a personal store where you can display your merchandise and sell them to interested customers. The sales can take place online or through the offline Shopify POS option. 

With over ten years of providing online shopping experience, Shopify is now the ruling commerce platform invented for businesses of all kinds regardless of where you sell online- be it online, in-store, or on the move. With recent changes, Shopify is experiencing a record high boom that further cements their place in e-commerce.

This leading commerce platform was established over ten years ago when the founder needed a platform where he could quickly sell his snowboards. Altogether, he realised how difficult it was to get an e-commerce platform that could instantly help him. Hence, the creation of Shopify. The mission of Shopify is to make commerce easier and better for business owners.


Who Is Shopify For?

*How to Reduce Javascript Execution Time on Shopify: A Step-by-step Guide
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Shopify caters to almost all kinds of businesses, as long as you’re selling something. From a cosmetics store to a DJ selling mixtapes or tickets to events, Shopify gives room to diverse entrepreneurs from 175 countries and counting.

 The major classes of services and products found on Shopify include:

1. Physical Products

The physical products you sell could be anything from handmade/handcrafted items to manufactured or retailed products. So, whether you are into sales of custom-made clothes or packaged groceries, Shopify is an excellent place to sell.

2. Digital Products

Digital products include electronic products such as audio and video downloads, eBooks, electronic templates for emails, e-courses, etc. If you want to sell electronic versions of your products, your customers can easily shop for them through Shopify.

3. Consultations & Membership Subscription 

As a life or fitness coach, you can decide to create an online option for your clients to book and pay for your services conveniently. Other professionals can also use this option which Shopify provides for secure exchange between you and your clients. You could also sell your membership plans on Shopify.

4. Tickets

Shopify makes purchasing tickets easy, as an experience-centred business. Be it a tour guide business or art exhibitionist; you can sell tickets to your events via Shopify. 

5. Class Bookings

People in the education sector are not left out as you can give your students the options to book, buy or rent your lessons through Shopify.

6. Rental Services 

As a rental service business, you can rent out your products to your customers without meeting them first.

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What Do We Mean by Execution Time For Websites?

Execution time refers to the amount of time it takes to load, respond and display needed information. Recently, Google conducted a study that reveals that about 53% of people leave a site that doesn’t load in less than 5 seconds. Another study indicated that more than 64% of people don’t complete their shopping in a store because of the online store’s execution time.

This means that your website or e-commerce site is at the risk of redundancy if the loading speed is slow.

However, loading speed is not the primary factor responsible for slow responses on your site. JavaScript execution time is a prime culprit. Underlying web assets overwhelms the JavaScript elements that make the page responsive can make execution time slow. 

These additional elements add extra time to the default page load metrics and slow down the speed. If there is nothing dragging space with the routine JavaScript elements, execution time should be faster.

To maintain your credibility and relevance, your website cannot afford to be slow, or else, your visitors will leave you for a more interactive site. If you’re an online store owner, it’s imperative to remove hindrances and optimise your website well enough for seamless shopping.

One slow JavaScript execution time action that puts users off is when your website elements load before the significant functions are revealed. This action gives the user half their information and does not display all the interactive elements they need. The user would most likely get frustrated and leave the site.

You do not only lose visitors but also suffer traffic conversion rates. There are daily progress and inventions for improving web experiences and people want to get that information instantly. How can you optimise your store for a maximum shopping experience as well as massive sales?

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Step by Step Guide on How to Reduce JavaScript Execution Time Shopify

By now, you know the patient dog doesn’t eat the fastest bone when it comes to online sales. Your store should be search engine optimised to enjoy significant and quick transactions. It should equally have fast page speed and generally excellent site performance. 

Altogether, your website should load as quickly as possible to avoid abandonment from your shoppers.

The following pointers will help you run a well-optimised and fast loading Shopify e-commerce site. Below are analytical tools that will help you analyse page performance for your site:

1. Google PageSpeed Insight Tool

Google is always in the race to speed up the web; to that effect, they have provided different tools to help web developers and users do that. The PageSpeed tool analyses your site’s desktop and mobile performance. It does this by generating PageSpeed scores and recommendations on how to perform better.

You will find the essential elements of both mobile and desktop web services analysed individually under the PageSpeed tool. Some of those elements are:

  • Mobile page speed report.
  • Optimise images.
  • Minify JavaScript.
  • Get rid of CSS and render-blocking JavaScript in above-the-fold content.
  • Minify CSS.
  • Gzip compression.
  • Prevent redirects of the landing page.

Apart from PageSpeed Insights, you can use the Test MySite tool which helps you check how interactive and fast your mobile site is.

Gmetrix and Pingdom are another set of tools for checking website speed and optimising your Shopify website performance. They are also free to use. Like PageSpeed Insights, they score you and give you suggestions on how to improve your site. 

2. Increase the Speed of Your Page With AMP

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AMP stands for Accelerated Mobile Pages, and it is an open standard framework created for developers to design web pages that will post super-fast on your mobile devices. This particular tool is significant because most shoppers find it easier to shop on their mobile devices than their desktops. After all, it is mobile device convenient. 

Shopify allows its users to activate AMP pages for speedy and efficient web experience. Examples of AMP apps you can use on your Shopify store are RocketAMP and FireAMP. These apps help to enhance page speed and reduce the mobile load time.

3. Optimise Your Mobile Page by Compressing Your Images

Many Shopify store owners are oblivious to the importance of compressing images because they want to put up bright and sharp pictures. Because they fear losing proper image resolution, they shy from compressing.

However, it is crucial to compress images as it determines how fast or slow your pages will load. Avoid adding a lot of images to one page or using images that are too large or too small. 

To retain image quality, use a site like to reduce image size without losing picture quality. Also, for rapid JavaScript execution time on Shopify, it is best to use these image formats:

  • PNG.
  • Progressive JPEG.
  • GIF.
  • JPEG or JPG.

Page load speed will improve after you upload compressed images.

4. Use Rapid and Interactive Shopify Theme

For a fast-loading Shopify site store, get an updated theme. Preview the theme to test for speed and responsiveness through PageSpeed Insight, which will also suggest better performance tricks.

5. Resist Installing Numerous Apps

When you install too many apps or plugins through Shopify, especially apps you don’t use actively, you add CSS and JavaScript files to your site store. These excess files further slow down the website’s performance.

So, take your time to take a look at the backend and uninstall and delete unnecessary apps. By the time you clear some space, you will enhance your site’s speed performance and enable shoppers to shop with ease.

6. Limit the Number of HTTP Requests Made 

HTTP (Hypertext Transfer Protocol) requests occur every time your browser retrieves a record, page, or image from a web server. When your retrieval requests increase, your browser will take longer to respond because of the multiple requests. 

To reduce HTTP requests, check out the HTTP Requests Checker by Gift Of Speed. It will help you collate the number of HTTPS requests made by a page. After knowing the total number of HTTP requests, you can reduce them by: 

7. Combining CSS/JS Files

Instead of making your browser retrieve multiple JavaScript or CSS files, you can combine your CSS and JavaScript files into a single large file to reduce page loading duration. This method might prove difficult because scripts and styles of either programming language are distinct from each other. Nevertheless, this trick will work for speeding up your page execution time, so it is a better option. 

8. Do Not Load With Queries Unless It Is Necessary 

Forcing the browser to load unnecessary multiple scripts on your mobile when the function is only useful on a desktop will slow down the page loading speed. The same thing applies to when you force your browser to load files suited for mobile rather than desktop. 

Instead, use conditional statements to load the files you need to increase page speed. 

9. Add Only Necessary Images 

A page loaded with too many or large images will practically crawl. Sometimes, you don’t need all those images to achieve your goal. Once you observe that you have such photos, delete some of them. Apart from increased page loading speed, you will also notice that your UX will improve significantly because you no longer have distracting images on your webpage.

10. Limit the Number of Redirects  

When there are too many cases of redirects, the performance will most likely be slow. Reduce the number of redirects in Shopify with the inbuilt ‘URL redirect’ function. To repair broken links on Shopify, use Broken Link Checked or Xenu, which is free broken link fixers.

10. Manage Tracking Codes Properly 

You usually have different codes for various tools. For example, your AdWords code is unlike Google Analytics, or marketing/remarketing tags, conversions tools and targeted goals tags. This separate code files add unnecessary load to your site and ultimately limit your site performance. Google Tag Manager, which is usable on your Shopify store, will help you manage all tags.

11. Avoid Using Sliders and Replace With Hero Layout Image

*How to Reduce Javascript Execution Time on Shopify: A Step-by-step Guide
Image credit: Cristina Morillo

Many people are familiar with Sliders because they have been around for a long time. As such, they have gained popularity among web developers. What people do with Sliders is to add five or six images with high quality to a slider, but this action overloads your website and makes it slower than it should be. Although convenient, you should dump Sliders because:

  • Only as little as 1% of people click on sliders.
  • Most users hate carousels and sliders and they limit your site visibility – meaning they hinder SEO.
  • Sliders do not work well on mobile.
  • Sliders hide your content and don’t do well for your page layout.

In place of this, you should be like Dropbox and opt for a single, top-quality main ‘hero’ image that is inviting. A hero image is a large banner image positioned at the front and centre of a page and is meant to attract web visitors and make them stay.

The image also includes essential details about the site in addition to the kind of content it offers. It can be in the form of text, image, or dynamic moving forms of either. For example, you can have your images or text rotating from one to the other.


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Reduce JavaScript Execution Time Shopify: In Conclusion

I hope this article helped you reduce JavaScript execution time Shopify. Using Shopify should be fun, easy, and productive. However, if your site is not well-optimised for these functions, you will only have frustrated and angry customers on your hands.

The bad part is that only a few returning customers will take the time to leave reviews about the lousy site experience. Also, new customers won’t even bother with that.

However, the practical tricks offered here should help you observe improvements in your web page load time. 

What other problems have you experienced with your Shopify site store? Were you able to solve them and how? Do share in the comment section. Don’t forget to invite someone to read too.