The solution will be to edit the file 'show' of the view "product" via the menu Display->Views and remove the blocks of code for information that doesn't change from one variant to another.
For example, if the description is always the same, you can remove that code:
<div id="hikashop_product_description_<?php echo $variant_name;?>" style="display:none;">
<?php echo JHTML::_('content.prepare',preg_replace('#<hr *id="system-readmore" */>#i','',$variant->product_description));?>
</div>
That will reduce the size of the page, its processing and allow browser to download the page much faster