Defer JavaScript

Defer JavaScript



Magento Platform
Open Source (CE)
1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2, 1.9.3
Commerce using on prem (EE)
1.10, 1.11, 1.11.1, 1.12, 1.13, 1.13.1, 1.14, 1.14.1, 1.14.2, 1.14.3,,,,,,,

Tech Specifications

Current Version:
Stable Build
18 September, 2017
Extensions, Site Optimization
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 IE Windows: 10, 11, 8, 9, Edge
License Type:


Defer JavaScript extension helps to reduce loading time by deferring the loading of the JavaScript until it's actually needed.

Other Extensions by Bss Commerce


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In the world of online e-commerce, inefficiency costs money. Even one second delay in your site response time can make the difference between a loyal customer and one that clicks over to the sites of competitiors? Therefore, slow loading time especially caused by JavaScript can be one of the fastest killer of a possible sale.

Defer JavaScript extension is a very ideal solution for this issue by deferring JavaScript till the last moment after all HTML and CSS to improve site speed most effectively.


  • Automatically defer your JavaScript loading till the last moment to speed up websites

Basically, Deferring means that the other HTML files and CSS will be loaded first then parsing of JavaScript files is implemented after all. This extension helps automatically put JavaScript files to the end of page after loading all HTML and CSS to avoid users seeing a blank page while JavaScript loads. Therefore, it merely rearranges the loading process so that JavaScript is deferred until the last possible moment - the outcome of this process is that your page appears much quicker.

  • Perfectly defer Iframes also

Your website often contains a lot of embed code of other sites, which causes your site perform more slowly because the browser has to load JavaScript files of these webpages. With Defer JavaScript module, this problem is completely solved by deferring Iframes of embed webpages until your site finishes loading. Therefore, this thing also contributes to effectively reduce loading time and enhance site speed.

  • Improve your ranking with major search engines

By installing Defer JavaScript extension, your site speed is considerably improved and makes search engines have a better evaluation about site performance. The reason is that site speed is also an important factor to decide ranking of Magento websites on search engine result pages. Therefore, when your website performs faster, it can has higher ranking and attract more clicks than websites with slower speed.

  • Easily configure/enable/disable punch from the admin panel





  • Effectively speed up Magento site performance

Deferring JavaScript is listed as one of the most impactful performance enhancements you can make among many other website optimization tips. Hence, this module can both help store owners get more benefits about ranking and bring customers the best shopping experience without waiting so long for content as before.

  • Easily configure from the backend

Defer JavaScript extension is thoroughly tested by our best developers and many Magento store owners to ensure that it’s well-compatible with default Magento and hardly find any conflicts. Users can easily make configuration for much more specific settings to make it suitable to your requirements.


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Release Notes

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  • Compatible with Open Source (CE) : 1.6 1.6.1 1.7 1.8 1.8.1 1.9 1.9.1 1.9.2 1.9.3
  • Compatible with Commerce using on prem (EE) : 1.10 1.11 1.11.1 1.12 1.13 1.13.1 1.14 1.14.1 1.14.2 1.14.3
  • Stability: Stable Build
  • Description:

    Version 1.1.2: Defer iframe


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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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