This thread is resolved. Here is a description of the problem and solution.
Problem: Slow checkout since woocommerce update 4.0.1 and wpml woocommerce.
Solution: smtp email and hook below helped me make the checkout faster..you can close the threat On some servers, the sending of checkout-related emails can cause trouble. You can enable the following filter to defer emails from sending until after the order is sent through, which speeds things up:
add_filter( ‘woocommerce_defer_transactional_emails’, ‘__return_true’ );
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