Description:
------------
file_exists, include, include_once, require, require_once and getimagesize are about 10x slower than their php4 version.

Using Apache 2.0.48, Windows XP
Php 5.0.0 versus Php 4.3.6 on the same computer.

Reproduce code:
---------------
Tested using this function either with file_exists, include, include_once, require, require_once and getimagesize 

function FileExists($file,$nb,$para="")
{
$aT=array();
$aT[0]=microtime(false);
for($t=0;$t<$nb;$t++){
    file_exists($file);
    }
$aT[1]=microtime(false);

return $aT;
}


Actual result:
--------------
Mean for 100 repeated tests
Using php 5.0.0:

include mean: 0.0029407 (s) 
require mean: 0.0030178 (s) 
include_once mean: 0.0022040 (s)  
require_once mean: 0.0023427 (s)
file_exists mean: 0.0000355 (s)  
file_exists and clearstatcache mean: 0.0013877 (s)

Using php 4.3.6:

include mean: 0.0002966 (s) 
require mean: 0.0002929 (s) 
include_once mean: 0.0001056 (s)  
require_once mean: 0.0001038 (s)
file_exists mean: 0.0000028 (s)  
file_exists and clearstatcache mean: 0.0000749 (s)