January 24, 2022

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How to Cut Down Page Load Time in JavaScript

4 min read
website design company

JavaScript (or simply, JS) is by far the most popular programming language for building websites. From adding special functions to your web pages to loading dynamic data using Ajax – this programming language is very developer-friendly. That’s why every leading website design company in Bangalore employs JavaScript experts.

However, the developer-friendly features of this programming language come at a price. An average web designer in Bangalore will have to rely on extensive JavaScript libraries. These libraries add hundreds or even thousands of kilobytes to each web page. The bigger the sizes of your web pages, the more time they’ll take to load, and Internet users hate waiting.

That’s why website owners (especially business websites) must invest in techniques to boost their websites’ loading speeds. Collaborate with the best website design company in Bangalore to trim down your websites. Here are some simple speed-boosting techniques you can execute with JavaScript.

Compress Your Website’s JavaScript

Your website’s JavaScript can slow down its speed in various ways. The bigger your website’s JavaScript file, the more time it will take to load. That’s because browsers stop page rendering to load and execute the large JavaScript file. So, avoid adding too much data to your JavaScript file.

To make your slow-loading JavaScript faster, make the file itself smaller. This process is called “compressing.” A succinct way of “compressing” is by removing whitespace, comments, and other components in your JavaScript file. However, manually making these changes is risky, especially if your website’s source code is not formatted properly.

Here’s an alternative way of compressing your website’s JavaScript file –

  • Run Js to review your website’s source code. Verify that its formatting is clear.
  • Use a tool called “YUI Compressor” to start compressing your website’s JavaScript from the first command line. The YUI Compressor will review your website’s source code. It won’t change the source code while compressing it.
  • This tool will remove extra spaces, comments, etc., from your website’s source code. The tool will also shorten all variable names wherever it deems appropriate.

Debugging the Compressed JavaScript File 

Once you’ve compressed your website’s JavaScript, debugging it can be challenging because all variables’ names are altered. Before taking this step, create a debugged version of your web pages. This version should reference all the original files. Test this version first before deploying the compression tools.

Deferred JavaScript Runs Faster

Deferred JavaScript runs faster. The way browsers render the HTML of web pages with deferred JavaScript is different. Browsers don’t have to wait for the JavaScript file to load or execute. Hence, the pages load faster.

Understanding Deferred JavaScript

Synchronous and asynchronous – these are the two ways a website design agency will add external JavaScript files.

  • Synchronous JavaScript stops web page rendering while it’s loading. Only after executing the JavaScript can the browser perform page rendering.
  • With asynchronous JavaScript, the browser can perform page rendering almost instantly. Asynchronous JavaScript doesn’t block the rendering of web pages.

That’s why using Asynchronous JavaScript is a more speed-efficient option for every web designer in Bangalore. Asynchronous JavaScript can be created in two ways (both faster than synchronous JavaScript) –

  • Via the “a-sync” attribute (<script async src = “script.js”>)
  • Via the “defer” attribute (<script defer src = “script.js”>)

The defer attribute makes sure that browsers don’t freeze when loading the website’s JavaScript. Until the website’s HTML is executed and loaded, the JavaScript loading process is delayed. Hence, browsers finish executing the HTMLs faster. They can produce the web page on the screen much faster.

Combine Your Files

A simpler way of making websites load faster is by integrating multiple JavaScript files into one. Any website design agency can perform this technique within seconds. Browsers can only have a limited number of connections with a website at a time. Setting up each connection requires plenty of resources.

Combining multiple, small-sized scripts into a bigger one makes much sense. Ask the best website design company in Bangalore to combine your website’s files manually. Major websites like Yahoo and Google use “G-zip” to compress their files. Calculated compressing and combining can reduce your JavaScript file’s size by up to 75%.

Delay Your Website’s JavaScript

Don’t make your website support on-demand JavaScript loading. Instead, ask your website design company in Bangalore to load your site’s script in the background. The advantage of this is that the initial pages of your website will load faster. The extra functions or advanced features will load later (5 to 10 seconds later). But that’s fine. The key is ensuring that users don’t have to wait while accessing the initial page.

Use AngularJS

AngularJS is the most popular Single Page Application (SPA) framework. Use it to develop websites with app-like features and functions. You can still use HTML as your template language on this structural framework. But, you can also create dynamic web apps by extending the HTML’s syntax. Use SPAs to make your website feel more like an app than a regular website.

Final Take

Perform these techniques to build faster-loading websites. To learn more ways of making your website load faster, partner with professional web designers in Bangalore.

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