Hi,
Of course you will notice some difference once you rename this folder:
html/com_virtuemart/productdetails/
no doubt about it. It would be absurd if there was no difference. Because "CleanMart" is something.
After renaming that folder, these files won't be loaded anymore (on product details page):
/templates/gilad7rtl/html/com_virtuemart/assets/Flexible/flexible-zoom.css
/templates/gilad7rtl/html/com_virtuemart/assets/css/flexibleVM2Global.css
/templates/gilad7rtl/html/com_virtuemart/assets/Flexible/flexible-zoom.min.js
/templates/gilad7rtl/html/com_virtuemart/assets/Flexible/productUpdater.js
BUT -3 seconds difference? no way. 3 seconds to load these files are no much.
I don't know what can be done to reduce the load though. Try to use a CSS and JS compression plugin. The best jooml plugin for CSS and JS optimization is this:
extensions.joomla.org/extensions/core-enhancements/performance/site-performance/12088
It is a free plugin and it will combine and minify JS & CSS files, then save them to CACHE folder.
This plugin will definitely increase the static content performance. (we use that plugin on flexiblewebdesign.com main website as well and we are having wonderful performance boost)
BUT BE AWARE!! Combining and minifying JS files will most likely cause jQuery Conflict. Be very cautious while using this plugin. Don't include the jQuery Library JS file into minified file.
regards.