Admin block speed up

Admin block can slow down large site for administrators significally.
Its becouse inefficient SELECTS in adminblock_block. Just get rid off INNER JOIN's.
Comment select will look like

    if (user_access('administer comments')) {
      $result = db_query_range('SELECT c.timestamp, c.subject, c.cid, c.nid 
        FROM {comments} c 
        WHERE c.status = 1 
        ORDER BY c.timestamp DESC ', 0, $nlimit);
      $comment_count = db_num_rows($result);
      $comment_count_display = $comment_count > $nlimit ? ' ('. $comment_count .')' : '';
      $items = array();
      while ($comment = db_fetch_object($result)) {
        $rnode = db_fetch_object(db_query_range('SELECT n.title FROM {node} n WHERE n.nid=%d', $comment->nid));        
        $items[] = check_plain($comment->subject) .' - '. format_date($comment->timestamp, 'medium') .'<br />['. l(t('node'), 'node/'. $comment->nid, array('title' => $rnode->title)) .']|['. l(t('edit'), 'comment/edit/'. $comment->cid) .']|['. l(t('delete'), 'comment/delete/'. $comment->cid) .']';
      }
    }

(in version 4.7)
Its an idea only. I'm not PHP nor DRUPAL guru :) I hope anybody will fix that.
In my large site speed improvement is about 10 times (from 1sec to 0.1sec)