Change batch size when importing members from CSV via AJAX

my_pmproiucsv_adjust_ajax_import_batch_size.php

<?php
/**
 * Change batch size when importing members from CSV via AJAX. Default: 50
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmproiucsv_adjust_ajax_import_batch_size( $number ) {
	return 10;
}
add_filter( 'pmprocsv_ajax_import_batch', 'my_pmproiucsv_adjust_ajax_import_batch_size' );