PHP - Imap_Open非常慢

I want use the imap_open fonction to check e-mail adresses (Outlook) but I don't understand why this function is very slow ? I start the script with WAMPserver in localhost.

<?PHP
$mbox = imap_open("{imap-mail.Outlook.com:993/imap/ssl/novalidate-cert}INBOX","MAIL","PASS");

If($mbox)
{
   echo 'connected';
}
else
{
   echo 'bad connections;
}
?>