Since Joomla uses JS through the CMS, there are chances for creation of maintenance overheads. The non-uniform usage of JS Libraries plays a vital role in reducing their reusability. The tight coupling of libraries with the DOM elements creates a problem under situations where a single page is made up of different views, depending upon the scripts. With the JS dependencies being loaded using a server side script, there's an existence of some unused scripts that tend to interfere with the basic functioning of the Joomla web portal.
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Multiple time loading of jQuery in Joomla 2.5 must be avoided
There have been constant discussions regarding the steps that need to be taken for preventing jQuery from loading multiple number of times across a wide range of extensions. One of the finest solutions to this issue in Joomla 2.5 is registering via JApplication to check whether jQuery is completely loaded or not. Under situations where a third-party extension loads the jQuery library, you can opt for including the below code snippet for preventing the ZOO extension called Widgetkit from loading it multiple times.