You have a lot of unnecessary Javascript junk in your template.
Jquery-noconflict occurs more than 1 time - your website doesn't need it
jquery-ui.min.js - you only use 19% - consider optimization
jquery.fancybox.js occurs 2 times in different versions.
The "frontend-edit.js" script appears publicly...
Google reCAPTCHA on all pages is not a good idea
This template was last updated in 2020 - seems to be incompatible with the last version of Virtuemart.
https://www.joomshaper.com/joomla-templates/megadeal-iiPS. In the first place on this page, I would disable "Impostazione cookie" - [cookie policy]. I haven't checked, but your plugin can block all necessary cookies by default. Applying such restrictions on the store's website does not make sense. This is a stupid EU directive - nobody verifies it. It only interferes with normal sales