wc-ajax=get_refreshed_fragments very long load time

Dear Kriesi

we use wp rocket as a caching plugin and we get quite satisfactory results

using pingdom tool we see that /?wc-ajax=get_refreshed_fragments takes half of the total load time.

Googling seems to be a bug in WooCommerce and there are a few workaround proposed.
We added in our functions.php
################################

remove_action( ‘wp_ajax_nopriv_woocommerce_get_refreshed_fragments’, array( ‘WC_AJAX’, ‘get_refreshed_fragments’ ) );
remove_action( ‘wp_ajax_woocommerce_get_refreshed_fragments’, array( ‘WC_AJAX’, ‘get_refreshed_fragments’ ) );
################################

and

################################
add_action( ‘init’, ‘my_deregister_heartbeat’, 1 );
function my_deregister_heartbeat() {
global $pagenow;

if ( ‘post.php’ != $pagenow && ‘post-new.php’ != $pagenow )
wp_deregister_script(‘heartbeat’);
}
################################

but they do not work

it work instead:
################################
add_action( ‘wp_print_scripts’, ‘de_script’, 100 );

function de_script() {
wp_dequeue_script( ‘wc-cart-fragments’ );

return true;
}
################################

but this have an important impact because your beautiful cart is not loading

Are you aware of this issue or I am the only Enfold client who has this problem? Do you have any solution?

Thank you Mauro