Disable Product Filters for WooCommerce on search results pages.

disable-wcpf-on-search-pages.php

<?php
/**
 * Disable Product Filters for WooCommerce on search results pages.
 *
 * This prevents the performance-heavy filter queries from running on search pages
 * while keeping filters active on shop, category, and other catalog pages.
 *
 * @param int|null $filter_id The filter project ID.
 * @return int|null The filter ID, or null to disable on search pages.
 *
 * Usage: Add via Code Snippets plugin, like SnipDrop or child theme's functions.php
 */
add_filter( 'wcpf_default_filter_id', function( $filter_id ) {
    if ( is_search() ) {
        return null;
    }
    return $filter_id;
} );