I need to import 6.5k products from xml file

Hi, I need to import 6.5k products. I am using code below but I can upload only 400 products and then time out … what should I need to do ?

$xml_response = simplexml_load_file('as.xml');

foreach($xml_response as $xml){
    $my_post = array(
        'post_title'    => (string) $xml->brand." ".(string) $xml->description,
        'post_content'  => (string) $xml->description,
        'post_status'   => 'publish',
        'post_author'   => 1,
        'post_type' => 'product'
    );

    $id = wp_insert_post( $my_post );
    wp_set_object_terms( $id, array(6), 'product_cat' );
    wp_set_object_terms( $id, 'product_type_custom', 'product_type' );

    update_post_meta($id, "_sku", (string) $xml->sku);
    update_post_meta($id, "_price", (string) $xml->price);
    update_post_meta($id, "_regular_price", (string) $xml->price);
    update_post_meta($id, "_manage_stock", 'yes');
    update_post_meta($id, "_stock_status", 'instock');
    update_post_meta($id, "_stock", (string) $xml->qty_available);
    update_post_meta($id, "_visibility", 'visible');
    update_post_meta($id, "_downloadable", 'no');
    update_post_meta($id, "_virtual", 'no');
    update_post_meta($id, "_featured", 'no');
    update_post_meta($id, "_backorders", 'no');

    update_post_meta($id, "_retread", (string) $xml->retread);
    update_post_meta($id, "_baseprice", (string) $xml->Baseprice);
    update_post_meta($id, "_weight_bruto", (string) $xml->weight_bruto);
}

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