Speedup WooCommerce admin area orders search

speedup-woocommerce-search-in-admin-area.php

<?php

/**
 * When you have many orders, searching in the WooCommerce admin section will be very slow.
 * The reason is that WooCommerce looks for the search term in many fields of the order
 * (such as billing address and shipping address).
 * With the following code, you can search only the metas you need.
 * For me, only the first name and last name were important.
 * Of course, the search will still be done based on the phone number, email and order number,
 * and there will be no problem in the main function.
 */
 function ywp_disable_search_in_order_meta( $args ) {
    return array(
        '_billing_first_name',
        '_billing_last_name',
    );
}

add_filter( 'woocommerce_shop_order_search_fields', 'ywp_disable_search_in_order_meta' );

// The code goes to your active theme/child-theme's functions.php file
// TESTED AND WORKS