Issue with Load time PhpMailer (Execution) - email

Question

I have a problem with phpmailer takes about 5 seconds to send 10 emails, I think that is a long time, because I need to send some 100 or 200 emails and the script takes too long and I get error 500.
Work with maybe 10 or 20 emails, but if i have more show error.
Need help please.
Note: $email2 is array emails.
require 'smtp/PHPMailerAutoload.php';
$mail = new PHPMailer;
//$mail->SMTPDebug = 2; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = "localhost"; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'contacto#xxx.com'; // SMTP username
$mail->Password = 'password'; // SMTP password
$mail->SMTPSecure = 'ssl'; // Enable TLS encryption, `ssl` also accepted
$mail->SMTPKeepAlive = true; // SMTP connection will not close after each email sent, reduces SMTP overhead
$mail->Port = 465; // TCP port to connect to
$mail->CharSet = 'UTF-8';
$mail->setFrom('contacto#xxx.com', 'Website');
$mail->Subject = 'Se ha actualizado tu serie favorita';
$mail->AltBody = 'Para ver este mensaje, use un visor de email compatible con HTML!';
$mail->addReplyTo('contacto#xxx.com');
$mail->isHTML(true);
$mail->Body = 'The Body is HTML Code';
if($vtitle == "Existe") {
foreach($email2 as $email3)
{
$mail2 = clone $mail;
$mail2->addAddress(''.$email3.''); // Add a recipient
$envio = $mail2->send();
}
} else {
echo "El Capitulo no Existe";
}
if(!$envio) {
echo 'El Mensaje no ha podido enviarse.';
echo 'Error: ' . $mail2->ErrorInfo;
} else {
echo 'El Mensaje ha sido enviado.';
}
If I change SMTPAuth to False for not authentication is the same problem.