Hello,

Yes, you are right. By default, WordPress AJAX requests use this file. WooCommerce in its turn created a separate entry file for it. But as WooCommerce doesn’t have AJAX on the single product page we implemented our own function and it uses standard WordPress core API. We will take some time to investigate it and check if it is possible to do this via WooCommerce file and get back to you. But in general, plugins you use shouldn’t slow your website down. If they slow that particular request then they will slow all things on your website. So we would like to suggest you investigate plugins performance too.

Kind Regards