看看woocommerce代码，没有针对该选择的ajax请求，因此缓存没有任何用处。这种缓慢来自javascript/select2，它有太多的显示选项。

然而，Woocommerce留下了足够的操作、过滤器和挂钩，因此可以更改此select2的行为

我制作了一个小插件，可以通过执行限制为100个术语的ajax搜索来解决您的问题，而不是在select2中显示所有术语

功能。php

<?php
/**
 * Plugin name: WC Fix Attributes
 * Version: 1.0
 * Author: Tofandel
 * Description: Fixes the slowliness of a select2 in woocommerce admin when having huge numbers of product variation terms
 */

/**
 * Filter to prevent displaying all of the attribute terms and only display the ones selected in the product
 */
add_filter( \'woocommerce_product_attribute_terms\', function ( $args ) {
    global $post;

    if ( $post ) {
        $product = new WC_Product($post);

        $includes = [];
        $size = 0;

        foreach ($product->get_attributes() as $attribute) {
            /**
             * @var WC_Product_Attribute $attribute
             */
            $opts = $attribute->get_options();
            $includes = array_merge($includes, $opts);
            $size = max($size, sizeof($includes));

        }
        $args[\'include\'] = $includes;

        $args[\'number\'] = $size; //Will output only the selected terms
    }
    return $args;
} );

/**
 * Hack so we can get the term taxonomy (because WC forgot to print it somewhere)
 */
add_action( \'woocommerce_product_option_terms\', function ( $attribute_taxonomy, $i, $attribute ) {
    echo \'<span class="attribute_taxonomy_getter" data-taxonomy="\' . esc_attr( $attribute->get_taxonomy() ) . \'"></span>\';
}, 10, 3 );

/**
 * Enqueue script
 */
add_action( \'admin_enqueue_scripts\', function () {
    wp_enqueue_script( \'wc-fix-attributes\', plugins_url( \'script.js\', __FILE__ ) );

    wp_localize_script( \'wc-fix-attributes\', \'WCFixAttributes\', [
        \'ajaxurl\' => admin_url( \'admin-ajax.php\' ),
        \'nonce\' => wp_create_nonce( \'wc_fix_search_terms\' ),
    ] );
} );

/**
 * Ajax search
 */
add_action( \'wp_ajax_wc_fix_search_terms\', function () {
    // Permissions check.
    check_ajax_referer( \'wc_fix_search_terms\' );

    if ( ! current_user_can( \'manage_product_terms\' ) ) {
        wp_send_json_error( __( \'You do not have permission to read product attribute terms\', \'woocommerce\' ) );
    }


    if ( ! empty( $_REQUEST[\'taxonomy\'] ) ) {
        $terms = get_terms( [ \'taxonomy\' => $_REQUEST[\'taxonomy\'], \'number\' => 100, \'name__like\' => $_REQUEST[\'term\'] ] );

        $terms = array_map( function ( $term ) {
            return [ \'text\' => $term->name, \'slug\' => $term->slug, \'id\' => $term->term_id ];
        }, $terms );

        wp_send_json( [ \'results\' => $terms, \'success\' => true ] );
    } else {
        wp_send_json_error();
    }
} );

脚本。js公司

jQuery(function ($) {
    // The woocommerce select2 is initializing
    $(document.body).on(\'wc-enhanced-select-init\', function () {
        //We need to wait a bit for it to be fully inited
        setTimeout(function() {
            $(\'select.attribute_values\').each(function () {
                var $that = $(this);
                $that.select2({ //Add an ajax option to it, to search the terms dynamically
                    ajax: {
                        url: WCFixAttributes.ajaxurl,
                        dataType: \'json\',
                        type: "GET",
                        quietMillis: 400, //Typing delay before sending the request
                        data: function (term) {
                            return {
                                action: \'wc_fix_search_terms\',
                                _wpnonce: WCFixAttributes.nonce,
                                // Get the taxonomy printed from our action
                                taxonomy: $that.parent().children(\'.attribute_taxonomy_getter\').data(\'taxonomy\'),
                                term: term.term
                            };
                        },
                    }
                });
            });
        }, 100);
    })
});