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Defer JavaScript for Magento 2

Reduce loading time, improve store performance and customer shopping experience with Magento 2 Defer JavaScript!
  • Defer parsing of Javascript to improve the rendering speed of sites
  • Effectively defer Iframes embedded on websites
  • Exclude homepage from deferring Javascript impact
  • Allow listing controllers and paths to be unaffected by deferring Javascript
  • Raise your ranking on SERPs

⇒ Proud to be the BEST Magento 2 Defer JavaScript extension for your website!

Community: 2.0.x - 2.1.x - 2.2.7 - 2.3
      |      Enterprise: 2.0.x - 2.1.x - 2.2.7 - 2.3

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Free Installation
Free 1-Year Support
$75 $50

If your website is SLOW, you’re losing money FAST

According to Kissmetrics, 40% of customers abandon a website which takes them more than 3 seconds to load. Furthermore, they also said that a 1-second delay in page response can result in a 7% reduction in conversions. Hence, poor site performance means both customer and money loss.  If you ignore, you are definitely a loser in the extremely competitive market.

Why can defer parsing of Javascript improve website performance?

The browser often loads codes from the top to the bottom of the page, it has to load the content of all <script> tags, which adds additional time to load the page. Thus, deferring parsing of Javascript helps to delay Javascript loading until the last moment when the browser finishes HTML and CSS loading. This makes necessary contents receive loading priority over JavaScript snippets that don’t need to be executed immediately. As a result, visitors don’t have to wait so long for content to appear, which improves customer shopping experience effectively.  

  • Defer parsing of javascript to enhance the rendering speed of sites

magento 2 defer javascript extension - page speed after installing

As my explanation above, deferring JavaScript has a big impact on the time a website renders. By moving all JavaScript to the end of the page to be loaded later, the loading time can be reduced. We can depend on results generated by Gtmetrix to measure how well the site is performing.

magento 2 defer javascript extension - page speed before installing

  • Effectively defer Iframes embedded on websites

It means that the browser finishes loading your website before loading Iframes of other sites embedded on your webpage. The reason is when these sites are embedded on your site, the browser simultaneously load JavaScript files of these pages, which can slow down your webpage. Hence, using Magento 2 Defer JavaScript extension, there is no need to worry about the impact of external Iframes processing on your site performance anymore.

  • Raise your ranking on SERPs

Google indicated that site speed is used in ranking a websiteon both desktop and mobile searches. If you optimize the page speed by deferring JavaScript, it is obvious that your website is possible to be in a higher rank than other competitors with poorer performance.

  • Exclude homepage from deferring JavaScript impact

It is easy for you to enable or disable affection of Javascript deferring on the homepage in the module configuration.

  • Allow listing controllers and paths to be unaffected by deferring JavaScript

If you desire to exclude specific controllers and paths from being impacted by this feature, you can list them in the configuration based on a provided format. Besides, this module also supports displaying these controllers and paths in a table at the end of the page.

exclude paths and controllers

It’s your turn now!

This is one of the very hottest extensions we developed to serve customers over the past years. Many users trust, make purchase decision and get better results. And it’s your turn now!



  • Great extension at cheap price
    Magento 2 Defer Javascript is truly good in budget and the features are even beyond my expectation
    verified buyer
    Reviewed by Benjamin on 22 February 2019
  • Higher prices but everything is well guaranteed by experienced developers
    I think I am a fastidious customer because I had a bad experience with another extension provider, they even made my site worse with low-quality code. Hence, coming to BSS, I am very careful to avoid the same situation as before. However, BSS extension and developers are so good, there is no bugs or any problems on my website since I installed it. I also appreciate LiveChat team when they gave me useful explanation and advice before purchasing. Thank Katies so much!
    verified buyer
    Reviewed by Francois Kelder on 13 February 2019
  • Your cheap price is crazy!
    Never expected to invest such a good extension with only 50 dollars. Keep up your good job.
    verified buyer
    Reviewed by Pauline on 13 February 2019
  • Seem like my site becomes faster
    The features of Magento 2 Defer Javascript work as described that boost the site speed a lot!
    verified buyer
    Reviewed by Virj Sumalinog on 22 January 2019
  • Quick support!
    I came across a little problem with the settings and Robin of your support team helped me out quickly. Thanks again.
    verified buyer
    Reviewed by Kamille on 03 January 2019
  • Keep up your good work
    Your team never disappoint me with your extension. This Magento 2 Defer Javascript also either. Keep your hard work up!
    verified buyer
    Reviewed by Shanelle Mullin on 18 December 2018
  • Professional support - Thumbs up
    Best support policies I have ever experienced, from installation service to developer support service.
    verified buyer
    Reviewed by Luís Correia on 12 December 2018
  • This extension does make my Magento 2 site load faster
    Hey BSSCommerce team,
    After installing your M2 Defer Javascript, even customers left positive comments about site loading. My sales also increase a lot. Thanks so so much!
    verified buyer
    Reviewed by Tyrone Taylor on 03 December 2018
  • Attractive deal for effective features
    At first, I didn't expect that this Defer Javascript for Magento 2 extension would run so well at such a lower price. Turn out that my site loading s double faster. Awesome!
    verified buyer
    Reviewed by Doug Marchand on 05 November 2018
  • 5 stars for good extension!
    Massive size of JavaScript had truly slowed down my site and your Magento 2 Defer Javascript blew the headache away.
    verified buyer
    Reviewed by Serena J. Simons on 18 October 2018
  • Speed booster
    My online store load very fast after activated this extension.
    verified buyer
    Reviewed by Landon Goins on 17 July 2018
  • Awesome extension
    Support is great, quick and to the point in resolving issues.

    Don't hesitate to buy from BSScommerce.
    verified buyer
    Reviewed by Ads on 20 April 2018
  • Great Service - Great Module
    Great module, works as advertised. No conflicts! It help my site load faster than ever. Thanks for a great extension!

    Highly recommend to install for all Magento 2 sites!
    verified buyer
    Reviewed by Alvin D. Carroll on 18 July 2017
  • Very useful for me!
    This is nice and very helpful extension for me. I easily installed it and speed up my website quickly.

    Highly recommend to install for Magento 2 websites!
    verified buyer
    Reviewed by Elliot Aardema on 12 July 2017
  • Worth for money
    Your extension is nice and effecive. Although Magento support required Js but I think it is not enough. My website still run slow. Therefore, I choose your Defer JavaScript to improve it. And the result is so great. It is running smooth and faster than before.

    Highly recommend to Magento 2 sites to use!
    verified buyer
    Reviewed by Giraldo Zito on 30 May 2017
  • Plug 'n Play
    This is really Plug 'n Play solution to make the JS deferral in a glimpse of an eye.
    Installed under M2 2.1.1 and works as advertised! Thanks!
    verified buyer
    Reviewed by Viktor Z. on 30 September 2016
  • Super useful
    From 0/100 in Gmetrix, my site load was 100/100 after installing Defer JavaScript. For $50, this extension is beyond expectation.
    verified buyer
    Reviewed by Alex Weber on 30 June 2016
  • Worth a try!
    It is exactly the answer for my trouble. Now my site has been improved and attract more customers. I am really pleased with it.
    verified buyer
    Reviewed by Maria on 24 March 2016
  • Highly appreciate!
    A really wonderful extension I can find. Highly appreciate. Keep moving forward!
    verified buyer
    Reviewed by Oscar on 22 March 2016
  • Good service!
    I love the way you support me. Very enthusiastic and professional!
    verified buyer
    Reviewed by Susan on 16 March 2016
  • You rock!
    It is incredible! The effect is beyond my expectation! You have really done a great job!
    verified buyer
    Reviewed by Oliver on 15 March 2016
  • Compliments to the developers!
    My site has speeded up a lot. Your extension worked absolutely well.
    verified buyer
    Reviewed by Neil on 09 March 2016
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Release Note

  • v1.0.0: First Release
  • v2.0.2: Defer Iframe
  • v2.0.3: Fix unserialize issue on magento 2.2