How to Optimize

JavaScript for Better SEO

Website Optimization Tips Using JavaScript

Reported from a Youtube channel owned by Google developer advocate, there are several ways that can be done to optimize websites using JavaScript.

Avoid JavaScript files that are downloaded repeatedly

The first way to optimize JavaScript is to avoid JavaScript files that are downloaded repeatedly. The amount of JavaScript will increase if not considered, especially for each UI component that is stored in a separate file. The occurrence of this condition can increase the burden of each file that is downloaded, especially on websites that are only supported by HTTP1.

How to fix this, there are actually several ways that can be done to reduce the number of files downloaded. However, how to reduce this depends on the flexibility of the web platform used. This is because there are various content management systems that do not provide access to simplify JavaScript files or simplify JavaScript.

If you have access to make changes to JavaScript files, you can change the JavaScript file. The trick is to combine various small JavaScript files into one file to get one large file so that the download process is more efficient.

Avoid excessive DNS Lookup

The next way to optimize JavaScript SEO is that in the use of JavaScript, it is generally also obtained from other sites or what is called external JavaScript. If this condition occurs, the website must find DNS from other sites before the JavaScript file starts the loading process.

Therefore avoid excessive DNS Lookup on external JavaScript. If the JavaScript file loads from various different domain names, there is a possibility that DNS Lookup will experience overhead for each domain that refers to the JavaScript file.

Simply put, with the large number of external JavaScript, DNS Lookup will be excessive. This condition will slow down the loading time on the first visit of visitors to your website.

Remove inefficient JavaScript

The third way to optimize JavaScript can be done by removing JavaScript that is considered inefficient on the website. Please note that JavaScript with poor quality can slow down the website when it is opened.

If the website is slow, the user experience will also be disrupted and will feel uncomfortable. One tip that can be done in detecting whether the JavaScript file is efficient or not is to use PageSpeed ​​Insight.

Remove unused JavaScript

In addition to deleting or eliminating JavaScript that is considered inefficient, the next web optimization tip can be done by deleting JavaScript that is no longer used. By inputting similar JavaScript code repeatedly on each website page, the use of JavaScript will no longer be necessary.

This is because many sites do not utilize all the functions or features available in the library or JavaScript framework. However, the JavaScript code is not used but is still downloaded and broken down by the web browser. This will certainly waste your web host’s resources.

The way to detect unused JavaScript is to open the report tab in the Reduced unused JavaScript section in PageSpeed ​​Insight. Another way is to see the report tab in the Avoid enormous network payloads section and then check the Minimize main-thread work report tab.

However, in fixing this problem, it is recommended to apply the tree-shaking technique which can detect JavaScript that has never been called on the website before and is safe to remove.

Compress JavaScript files

The next way to optimize JavaScript is to always pay attention to the JavaScript files you download, make sure that you have compressed them when downloading, especially for large files. This is because if it is not compressed, the web browser will need to spend more CPU time and can slow down your website.

But don’t worry because to overcome this you can start by compressing the JavaScript file. In addition, you can also use a CMS like WordPress and take advantage of the available plugins.

Still using PageSpeed ​​Insight, to compress this JavaScript file you can check the Enable text compression report then on that tab will be shown various files that must be compressed. Make sure that in doing this compression is correct so that the appearance and function of the website you have does not change or is completely damaged.

Set the cache duration based on the JavaScript code

The last way that can be done to optimize the website is you can set the cache duration based on the JavaScript code. That way the web will avoid excessive processes when checking expired JavaScript files in the cache.

Why choose Mitra IT?

•⁠ ⁠Expert Team: We have a team of experienced and creative technology experts.

•⁠ ⁠Comprehensive Solutions: We not only provide technology but also offer full support to ensure your business success.

•⁠ ⁠Focused on Results: We are committed to helping you achieve your business goals.

Don’t miss the opportunity to maximize your business potential!

Contact us now for a free consultation.