Hello,
Unfortunately, we are not WPBakery plugin authors and can’t change the number of requests that it makes. Please, contact plugin author in the comments area and ask if they have any solution for this issue https://codecanyon.net/item/visual-composer-page-builder-for-wordpress/242431/comments .
Because we can’t help you with this. All that we can do it’s give you refund if you don’t get the answer from plugin authors.
Regards