是的，速度很快，使用WP Transients API 在短时间内缓存查询。

基本上：

if($saved = get_site_transient(\'SOME_SORT_OF_ID\')){
    echo $saved;
} else {

    ob_start();

    switch_to_blog(x); // x being the blog id your want to switch to
    // Do your quering and echoing here

    restore_current_blog(); // Revert to current blog   

    set_site_transient("SOME_SORT_OF_ID", ob_get_contents(), (60 * 60)); //Save query for one hour

    ob_end_flush(); // Echo and End Buffering      

}