Home » Guides Advanced Article

Optimizing JavaScript for Faster-Loading Web Designs to Gain Better SEO Value

Not rated

Timothy McKinley
December 04, 2017

Timothy McKinley

Timothy McKinley is an author cum professional motivator, who has a passion towards internet and media.  She is deemed to be, and expert in Organic Search Media and frequently posts on tech blogs.

Timothy McKinley has written 1 articles for JavaScriptSearch.
View all articles by Timothy McKinley...

When it comes to modern-day web designing, JavaScript is such a fantastic tool to aid in front-end web development. JavaScript helps in building highly interactive and feature-rich web components for faster and seamless performance. The front-end developers cannot work without the knowledge of JavaScript now, but if not used with expertise and insight, JS can be a double-edged sword.


Typically, a poorly-written code in JavaScript will end up dreadfully slowing down your web page and in turn, negatively affect the rendering speed. Load time is a key optimization factor now for the leading search engines, and on finding your web pages loading at a slower speed, the ranking may get instantly affected. To avoid this backfiring, let's cover some of the significant JavaScript tips to avoid the dark effect of it on your website performance.


JavaScript web designing tips

Set an appropriate loading order for the page elements

At the first point, ensure that all the content in the <head> tag get pre-loaded. Next, the subsequent content elements needed to get loaded in a logical sequence. Remember, any JavaScript elements put inside the <head> section may tend to slow down the rendering speed. On getting a non-optimized page loaded, the users may be seeing a white screen for a while before the page gets loaded altogether. On the other hand, an optimized page will get loaded in a step-by-step rendering manner, which allows the users the most important and primary content first and by the time they explore it, the page gradually gets loaded in full.

Minify the code for small file sizes

The concept of obfuscating code and minifying code are different even though both of these are transforming JavaScript. Minifying is making the JavaScript smaller, which helps to shrink file sizes and thereby cut down the load delays.

The additional spaces, comments, and line breaks used to increase the file size of JavaScript elements, which ultimately slows down page loading. This issue can be addressed well by compressing code. Machines which render the codes are not sensitive to visual elements as human eyes do. Computers can instantly read and launch any minified code much faster even if you make it by fitting all JavaScript into a single string.

Optimize JS

Similar to minifying, optimization is also another type of JavaScript shortening as advised by the Organic Search Media experts. Optimizing not only helps to delete the use of commas, comments, and white spaces, but it also aims to eradicate the ‘dead codes’

Find below an example to see how JavaScript optimization works

Without optimization

With optimization

In this case, the variable parent may never come into use, so it is cut out. Next the False if() {…} is considered as a dead code and get deleted. Ultimately true else is left as only one possibility, so it was kept, and return is deleted as it too is dead code.

Make use of HTTP/2 protocol

This is a unique encrypted version of the primary internet protocol, which offers you a lot of user-friendly cool features, the major one among them being its capacity to do an asynchronous download of the outside files as JavaScript. HTTP demands some complicated approach as like deep learning and in-depth knowledge of JavaScript, but HTTP/2 makes loading of JavaScript much faster. You can easily learn using HTTP/2 and efficiently incorporate it in web designing for better output.

Use the JavaScript CDN (content delivery network)

Content delivery networks help enhance the page loading speed by hosting it locally and load it from the nearest possible destination. However, CDN is not a one-stop solution to all. Say for example, if your project is not universal, but you opt for a CDN with no local server at your location, then you may be probably hurting relying on CDN as the page loading time will further increase. So, one need to be very careful while taking content delivery networks as sometimes, if not chosen well, it can have opposite impact.

You can get several online options to generate reports with which you can explore all available CDNs you can use and decide which one will be the most affordable and successful in your case. There are thousands of options actually to explore in CDN matching to your library, so take your time and explore it to find the best.

Some other JavaScript tips also include:

-  JavaScript asynchronous loading which is a unique sort of sync loading technique with which your website gets loaded in a multi-streamed manner.

-  Excluding the unused components in JavaScript libraries. You can alternatively use jQuery UI and jQuery Mobile too and includes all best components of various libraries to come up with the best output.

- Using the Gzip module for Nginx, Apache, and Node.js, etc.

-  Replacing JavaScript with CSS3 effects at possible sections to help enhance the performance.

As you can identify from above, there are plenty of techniques and technologies now to optimize the JavaScript code and speed up the page loading speed. The time and effort you put into research and identify new methods to make this task easier and effective will surely pay off for a long run.

Add commentAdd comment (Comments: 0)  



Related Resources

Other Resources