Hello,

the jQuery version packaged with Joomla has been patched with all security issues fixed in later versions of jQuery. Therefore, the reports are not correct if they only base their findings on the jQuery version number and not the content of the library files. That assumes you are up-to-date with your Joomla version as well.

You can try jQuery Easy in conjunction with JCHOptimize. The latest version addressed some of the compatibility issues and they can work together in more cases than before. Make sure you empty the JCH Optimise cache first before you make all your changes (or better yet: turn off JCH, purge all JCH cache files, setup jQuery Easy and turn JCH back on, making sure all changes are still there).

Make sure the option 'Head-only modifications' is set to 'yes' for best chances of compatibility with JCHOptimize (since you only need changes for the jQuery library which usually happen in the head part of an html document).

If you need additional support, if you don't have one, you can purchase a support membership on this site (from the jQuery Easy download page). 

Otherwise, your version of jQuery is safe, despite what tools tell you. Like I said previously, the Joomla team back-ported the fixes made to newer versions of jQuery as far as security is concerned.

Hello Eduardo,

the plugin can help if you have several versions of jQuery loaded on the page. It will remove the duplicates.

Also, using a CDN (having the jQuery file loaded from an external server close to the location of the visitor) mais reduce the loading time (you should test loading jQuery locally and loading it through Google CDN with the jQuery Easy plugin). Keep the solution that works best for your site.

As far as execution time is concerned, the plugin can help in the sense that you can choose a newer version of jQuery to run on your page. The latest jQuery versions are more lightweight and working more efficiently so you may reduce the execution time and the loading time by using the latest jQuery version. Now you have to make sure all your scripts can work well with the latest jQuery version. It would be even better if you could avoid loading Migrate. But that will depend on the javascript that relies on jQuery to work. Migrate may be required to keep the old scripts working (Migrate makes sure those scripts keep working even though they may use code that was removed from jQuery).

You should be able to test all that by yourself, but if you need extra help, you are welcome to purchase a support membership, as I mentioned before. The Pro version can help with Bootstrap and can target specific pages so you don't have to have the plugin modifications forced on the whole site. It also allows you to have different configurations on different parts of your site (so, for instance, you can use jQuery 1.12 on some pages and jQuery 3 on others).