debugging lengthy node saves

nzg_debug.module

<?php

function nzg_debug_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  switch ($op) {
    case 'insert':
    case 'update':
      $debug = array(
        'request'      => $_REQUEST,
        'server'       => $_SERVER,
        'node'         => $node,
        'request time' => $_SERVER['REQUEST_TIME'],
        'nodeapi time' => time(),
      );
      register_shutdown_function('_nzg_node_save_report', $node->nid, $debug);
  }
}

function _nzg_node_save_report($nid, $debug) {
  $debug['shutdown time'] = time();
  $debug['processing time'] = $debug['shutdown time'] - $debug['request time'];
  $filename = '/tmp/nodesave-' . $nid . '-'
    . $debug['shutdown time'] . '-'
    . $debug['processing time'] . '.txt';
  foreach (array('request time', 'nodeapi time', 'shutdown time') as $v) {
    $debug[$v] = strtotime($debug[$v]);
  }
  file_put_contents($filename, print_r($debug,1));
}

Did you write this on a train or something? It's far worse than airplane code :-P