WooCommerce

When the user places an order WooCommerce sends an Ajax request to your website.

Basically, the following processes will take place:
-The elaboration of the order
-The sending of the transactional emails

In some environments, the transactional emails that are sent after the user clicks on the button to place the order can noticeably slow down the process.

A temporary solution is using the functions.php code ”add_filter( ‘woocommerce_defer_transactional_emails’,’__return_true’ );” but I believe this should be a native feature of the Woocommerce experience.