Defer Javascript

  • Popularity Score 392 Popularity Score

    Popularity ScoreReferrals to Site/Downloads

    0 0 1+ 1+ 250+ 250+ 1000+ 1000+ 10000+ 10000+

Defer JS reduces loading time by deferring the loading of the JavaScript until it's actually needed.
Compatible with:
This extension is currently unavailable on Magento Connect. Please contact the developer.

You will be re-directed to the developer's website to complete your purchase.

You must be registered and logged in to get extension key.
In order to get this extension, you must be logged in to the Magento Community. Click here to login or register.

Magento Connect 2.0

Magento Connect 2.0

Previous Next

Defer Javascript

BSS Defer JavaScript 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. Deferring JavaScript is listed as one of the most impactful performance enhancements you can make among many other website optimization tips.


  • Automatically deferring your JavaScript loading
  • Effectively increases the JavaScript Effects
  • Improves your ranking with major search engines
  • Reduce load time and engage more customers
  • Easily configure/enable/disable punch from the admin panel
  • Free Installation and Lifetime Support
  • 100% Open Source

All the problems with Full Page Cache module are fixed and work perfectly with FPC module.




Why BSS Defer JavaScript is your must-have extension?

Effectively speeds up Magento site performance

In the world of online e-commerce, inefficiency cost 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 competition? Slow loading time, caused by JavaScript can be one of the fastest killer of a possible sale.

BSS Defer JavaScript is developed to solve out this issue. Let’s take a look at how amazing change BSS Defer JavaScript Extension brings out:
The below picture shows Page Speed Result of before installing BSS Defer JavaScript Extension.

And here is an incredible result which the same page has after BSS Defer JavaScript Extension is installed.

Defer JavaScript until the last moment

Basically, Deferring means that the other HTML files and CSS will be loaded first then parsing of JavaScript files is implemented after all. This has no effect on the performance or usability of your web page, 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.

Easily configure from backend

BSS 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. From administrator configuration, set “Yes” to enable page and set “No” as default to exclude Homepage.

Need help to install BSS Defer JavaScript?

BSS offers you the best installation support for Defer JavaScript and totally FREE. We are constantly installing our extensions on different version of Magento to get the best success solution for your store.

If you require any customization or need to add additional features in BSS Defer JavaScript Extension, don’t hesitate to Contact Us

  • Get instant support with our Live Chat. Visit our website:
  • Send an email to or
  • Leave us a message on Skype
M1 Extension Versions


2016-05-04 14:54:23
  • Version number: 1.1.1
  • Stability: Stable
  • Compatibility: 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2


2016-04-27 07:51:48
  • Version number: 1.0.9
  • Stability: Stable
  • Compatibility: 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2


2016-03-24 02:21:34
  • Version number: 1.0.8
  • Stability: Stable
  • Compatibility: 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2
Option to not defer selected script

Stable Version

2016-02-22 16:54:01
  • Version number: 1.0.7
  • Stability: Stable
  • Compatibility: 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2
Stable Version

Update Configuration Document with Full Page Cache by Mirasvit

2016-01-23 15:20:27
  • Version number: 1.0.6
  • Stability: Stable
  • Compatibility: 1.4,, 1.4.2, 1.5, 1.6, 1.6.1,, 1.7, 1.8, 1.8.1, 1.9, 1.9.1, 1.9.2
Update Configuration Document with Full Page Cache by Mirasvit
1 2

Magento 2.0 Support

This is regarding "Defer Javascript Extension" available at We plan to purchase this. But does this Support Magento 2.0? If not will you release a support version for the same? Reason being we are on and plan to upgrade to Magento 2 because of its new features Thanks
Asked by: samirdahotre
Thanks for your interest in our extension. Regarding Defer Javascript Extension for Magento 2, we recently released magento 2 version for this extension. You can check it at We do provide Free Installation, Lifetime Support, Lifetime Free Update and 30 Day Money back Guarantee for this extension. Feel free to contact us if you have any questions. Best regards from BssCommerce Support Team.
Answered by: Bsscommerce
Date published: 2016-07-09

defer javascript is not working

I have istalled the extension bss defer javascript but it dosnt seems to work on my site
Asked by: AjayTiwari
Hi, Thank you for your purchasing and we are so sorry for the issue you are having with our module. I am sure our support team contacted you and is supporting you. We make sure the module will work perfectly with your site after our support. Our customer support specialist got your feedback email from you, and our certified developer is resolving the module issue. Would you mind waiting till the fixing is completed and you will be amazed at the result of the module. If you have any issues with the module, please feel free to contact us, we are always willing to assist you instantly. Regards,
Answered by: Bsscommerce
Date published: 2016-05-10
  • y_2017, m_2, d_18, h_1CST
  • bvseo_bulk, prod_bvqa, vn_bulk_0.0
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
  • loc_en_US, sid_27542, prod, sort_[SortEntry(order=LOCALE, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_magento
Get Help

Support for This Extension

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.

Magento Platform Support

If you need support for a Magento platform, there are different options for support depending on which Magento platform you are using. Below are links for specific platforms.


About the Developer

This extension was developed by and is supported by Bsscommerce

Defer Javascript is rated 4.7 out of 5 by 18.
Rated 5 out of 5 by from Excellent extension Clean code, professional support team. Always fast responses and comprehent answers. This extension is a must have to improve your SEO.
Date published: 2016-12-18
Rated 5 out of 5 by from Excellent extension, must have!!! This extension deferred all of our javascript and made the site faster to load and gave us a 99% score in gtmetrix website speed report. The customer service and tech support was amazing and we couldnt be more happy with our purchase. Definately money well spent!
Date published: 2016-11-22
Rated 5 out of 5 by from Great Extension & Great Support This extension is very useful and does exactly what is described. Awesome is the support, the knowledge and professionalism of all the team: they are among the excellencies of the Magento developers. For sure I will use other extensions developed by BSS Commerce Team in the future.
Date published: 2016-08-09
Rated 5 out of 5 by from Good product and service Really good software, works well, the support team was very helpful. Very happy with the product and service.
Date published: 2016-05-10
Rated 5 out of 5 by from Works and great support When I installed it had some conflict with my theme js files. The developers created a dev site and solved the probelm for me. GTMetrix report shows an improvement and these guys were very helpful. A good deal for $25. Recommend.
Date published: 2016-04-28
Rated 5 out of 5 by from defering of javascript installed on magento CE, after speaking with developer in chat with some inital pre sales question works perfectly thank you very much
Date published: 2016-04-01
Rated 4 out of 5 by from Does what it says on the tin A great little module. I installed version 1.0.8 of the module. I have magento version 1.9.1. The installation is a simple upload to server. no files over written. Usual disale cache and log out and in to admin. Once in admin > config you can enable. simple and easy. I had not issues, however the developer was on hand in a chat session to answer questions of which they responded straight away. Once done quick check of site noticed improved speed. All good and recommend.
Date published: 2016-03-31
Rated 5 out of 5 by from Simple the best We have been searching a solution for the defer javascript on internet like anything. Defer Parsing was the main issue in the overall speed of our website but our search came to an end when we see this extension. We immediately contact the support and support was so helpful in helping us decide to buy this extension. Overall, a very pleasant experience.
Date published: 2016-02-05
Rated 5 out of 5 by from Great extension This extension sorted out our defer javascript problems we had when testing with webmaster tools and the likes. 0 problems and worked right away.
Date published: 2016-02-05
Rated 5 out of 5 by from Best way to defer parsing of javascript in Magento! After speeding up our website through the help of GTMetrix the only thing left was the message to 'defer parsing of javascript'. We looked through tutorials to do it ourselfs but without success. After searching for a while I came across this extension and decided to give it a try. It worked out of the box, even though some strange things were happening that later on could be addressed to a totally different change we made. The support team helped us find the problem even though it had nothing to do with their extension so we know they give great support as well!
Date published: 2016-02-05
  • y_2017, m_2, d_18, h_3
  • bvseo_bulk, prod_bvrr, vn_bulk_0.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_18
  • loc_en_US, sid_27542, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_magento

In order to upload extension, you must be logged in to the Magento Community. Click here to login or register.



* Required Fields

Close window

Forgot Your Password?

Please enter your email below and we'll send you a new password.

* Required Fields

Close window


To upload extension you must be logged in.

* Required Fields

Close window

You are using an outdated browser

We built Magento Connect using the latest techniques and technologies.
This makes Magento Connect faster and easier to use.
Unfortunately, your browser doesn't support those technologies.
Use the links below to download a new browser or upgrade your existing browser.