Description:
------------
On Linux it is really easy to read recursive folder-listings with SPL even if there are many files and folders, i need here between 1 and 3 seconds after cold start of the machine on my fedora-box

On Windows the same needs between 180 and 240 seconds and "process explorer" shows > 1 MB I/O the whole time, same script, same folders contents, same php-version

WHAT do you do on windows? 
Are you reading all the 30.000 files instead listing them only?

Test script:
---------------
<?php
$files    = array();
$folders  = array();
$spl_objects = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path), RecursiveIteratorIterator::CHILD_FIRST);
try
{
 foreach($spl_objects as $filename=>$spl_object)
 {
  if(DIRECTORY_SEPARATOR === "\\")
  {
   $filename = str_replace(DIRECTORY_SEPARATOR, '/', $filename);
  }
  if(substr($filename, 0, 2) === './')
  {
   $filename = substr($filename, 2);
  }
  switch($spl_object->isDir())
  {
   case false: $files[$filename] = $spl_object->getMTime(); break;
   case true:  $folders[] = $filename; break;
  }
 }
}
catch(UnexpectedValueException $e)
{
 error_log('Directory "' . $path . '" contained a directory we can not recurse into');
 return false;
}
sort($folders);
ksort($files);
$enumerate_list = array('files'=>$files, 'folders'=>$folders);
unset($folders);
unset($files);
?>

Expected result:
----------------
a normal performance

Actual result:
--------------
waiting minutes to get hughe folder-listings