Defer Javascript

Compatible With: Community 2.0, 2.1, 2.2 Enterprise 2.1, 2.2

Tech Specifications

Current Version:
Stable Build
05 December, 2018
Extensions, Content & Customizations, Personalization & Experience Management
Supported Browsers:
Chrome Linux: 42, 43, 44 Mac: 39, 44 Windows: 39, 40, 42, 43, 44 Firefox Linux: 31, 38, 39, 40, 41 Mac: 31, 38, 39, 40, 41 Windows: 31, 38, 39, 40, 41 Opera Linux: 7, 7.1, 8, 9 Mac: 7, 7.1, 8, 9 Windows: 7, 7.1, 8, 9 Safari Linux: 7, 7.1, 8, 9 Mac: 7, 7.1, 8, 9 Windows: 7, 7.1, 8, 9 Edge Windows: 42 IE Windows: 10, 11, 8, 9
License Type:


 This extension defers JavaScript loading by putting JavaScript files at the bottom of pages to reduce loading time and speed up Magento sites.  

Other Extensions by Bss Commerce


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 Site speed is one of the most significant concerns that every Magento business wants to optimize to improve the shopping experience and increase customer satisfaction. A website with slow loading speed will force visitors to wait for a long time and cause them to quickly leave the site and come to other competitors with the better experience. Hence, to make the website load faster, installing an extension like Defer JavaScript for Magento 2 is a simple and easy solution for online stores. 

This module put all Javascript files at the bottom of the page, which means that the browser will load all HTML and CSS first before loading Javascript files. In other words, postponing JavaScript loading can make Magento 2 based websites perform better, hence giving customers a more comfortable shopping experience.


  • Defer parsing of JavaScript to speed up Magento websites

Normally, the browser loads from the top to the bottom of the page and if your site includes a lot of JavaScript code between <head></head> and <body></body>, it often causes the site to load slowly and forces customers to wait so long for the content to appear. However, using Defer JavaScript for Magento 2, it will delay JavaScript loading until the last moment when all HTML and CSS loading is finished, in order to reduce loading time and speed up Magento sites.

  • Effective defer Iframes loading 

 In case there are a lot of sites embedded on your webpage, your site speed becomes slower because the browser even loads JavaScript files of these sites. Hence, to solve this issue, the extension allows the browser to load your webpage before Iframes of other sites to avoid making the speed be impacted.

  •  Exclude wished paths or controllers and homepage 

 Defer JavaScript for Magento 2 allows admin to easily exclude paths, controllers, and homepage so that they are not influenced by deferring parsing of JavaScript.






With Defer JavaScript for Magento 2, store owners do not worry about losing customers as well as revenues due to slow site loading. This module easily improves site speed without any manual interfere of code or any other complicated methods. Therefore, the shopping experience is enhanced and also stores keep a long relationship with customers.



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Release Notes

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  • Compatible with CE: 2.1 2.2
  • Compatible with EE: 2.1 2.2
  • Stability: Stable Build
  • Description:

    v2.0.3: Fix unserialize issue on magento 2.2


  • Compatible with CE: 2.0 2.1
  • Stability: Stable Build
  • Description:

    v2.0.1: Stable Version


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The best place to start if you need help with a specific extension is to contact the developer. All Magento developers have both a contact email and a support email listed.

Q & A

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