为什么phpmailer需要15秒以上才能加载？

Question

我最近将phpmailer设置为我的SMTP发送脚本，用于我一直在努力的网站，这只是一个令人头痛的问题。我的设置是IIS，我目前正在使用office365发送电子邮件（虽然我已经尝试过gmail而且结果并不快）。我会很感激如何提高速度，或者如果有＆＃ 39;一种从javascript或php发布到php文件然后让它工作的方式我也可以这样做。如果可能的话，我试图远离cron工作。

我的剧本：

function sendMail($code, $email) {
//Create a new PHPMailer instance
$mail = new PHPMailer;
//Tell PHPMailer to use SMTP
$mail->isSMTP();
//Enable SMTP debugging
// 0 = off (for production use)
// 1 = client messages
// 2 = client and server messages
$mail->SMTPDebug = 0;
//Ask for HTML-friendly debug output
$mail->Debugoutput = 'html';
//Set the hostname of the mail server
$mail->Host = "smtp.office365.com";
//Set the SMTP port number - likely to be 25, 465 or 587
$mail->Port = 587;
//Whether to use SMTP authentication
$mail->SMTPAuth = true;
//Username to use for SMTP authentication
$mail->Username = "support@[domain redacted].com";
//Password to use for SMTP authentication
$mail->Password = "[password redacted]";
//enable TLS
$mail->SMTPSecure = 'tls';
//Set who the message is to be sent from
$mail->setFrom('support@[domain redacted].com', '[redacted]');
//Set an alternative reply-to address
$mail->addReplyTo('support@[domain redacted].com', '[redacted]');
//Set who the message is to be sent to
$mail->addAddress($email);
//Set the subject line
$mail->Subject = 'This is a test email from EdTester Support';
//Read an HTML message body from an external file, convert referenced images to     embedded,
//convert HTML into a basic plain-text alternative body
$mail->Body = "Hello there, This is your activation e-mail. Please go to:         http://[domain redacted]/activate.php?code=". $code . "&email="     . $email;
//Replace the plain text body with one created manually
$mail->AltBody = 'This is a plain-text message body';

//send the message, check for errors
if (!$mail->send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;
} else {
    echo "Message sent!";
}
}