Speedengine DeferJS

Speedengine DeferJS



Magento Platform
Open Source (CE)
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, 1.9.3

Tech Specifications

Current Version:
Stable Build
18 July, 2018
Extensions, Site Optimization, Performance
License Type:
GNU General Public License 3.0 (GPL-3.0)


The SpeedengineDeferJS Extension by Bitware improves Magento 1 store performance by automatically deferring your JavaScript loading. 

Other Extensions by Bitware Technologies


Back to top

It helps you optimize your Magento website and Increases the Google PageSpeed score. The extension moves Javascript to the bottom of the page and solves the render-blocking Javascript problem. This will reduce loading time and engage more customers to enhance sales amount. You will need this extension if you want to optimize the frontend speed and improve the user experience of your Magento store.

Deferring JavaScript is listed as one of the most impactful performance enhancements you can make among many other website optimization tips. Hence, this Speedengine DeferJS extension 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.

List of Features:

  • Designed to preserve HTML validation: HTML CSS will not break after installing The SpeedengineDeferJS extension
  • Easily exclude wished paths: You can exclude JS which you don't want to defer.
  • Easily exclude wished blocks: You can exclude blocks which you don't want to defer.
  • Moves Javascript to the bottom
  • Simple backend interface
  • Provide easy configuration

Release Notes

Back to top


  • Compatible with Open Source (CE) : 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 1.9.3
  • Stability: Stable Build
  • Description:

    Bitware SpeedengineDeferJS
    This 0.1.3 release of Bitware SpeedengineDeferJS adds the following features to your store
    The extension is available for free
    Improve store performance
    Move all JavaScript at the bottm of page
    You can exclude JS which you don't want to defer.
    You can exclude blocks which you don't want to defer.
    Simple Configuration


Back to top
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

Back to top


Back to top