服务器响应非常慢PHPMailer gmail SMTP

我使用PHPMailer中提供的示例代码。首先，代码执行得很慢(在浏览器中加载至少1-2分钟)，然后给我一些错误。

<?php
/**
* This example shows settings to use when sending via Google's Gmail servers.
*/
//SMTP needs accurate times, and the PHP time zone MUST be set
//This should be done in your php.ini, but this is how to do it if you don't have access to that
date_default_timezone_set('Etc/UTC');
require 'phpmailer/PHPMailerAutoload.php';
//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 = 2;
//Ask for HTML-friendly debug output
$mail->Debugoutput = 'html';
//Set the hostname of the mail server
$mail->Host = 'smtp.gmail.com';
//Set the SMTP port number - 587 for authenticated TLS, a.k.a. RFC4409 SMTP submission
$mail->Port = 587;
//Set the encryption system to use - ssl (deprecated) or tls
$mail->SMTPSecure = 'tls';
//Whether to use SMTP authentication
$mail->SMTPAuth = true;
//Username to use for SMTP authentication - use full email address for gmail
$mail->Username = "myGmailId@gmail.com";
//Password to use for SMTP authentication
$mail->Password = "myPassword";
//Set who the message is to be sent from
$mail->setFrom('myGmailId@gmail.com', 'Andrew Mathew');
//Set an alternative reply-to address
$mail->addReplyTo('myGmailId@gmail.com', 'Andrew Mathew');
//Set who the message is to be sent to
$mail->addAddress('myOtherId@gmail.com', 'John Doe');
//Set the subject line
$mail->Subject = 'PHPMailer GMail SMTP test';
//Read an HTML message body from an external file, convert referenced images to embedded,
//convert HTML into a basic plain-text alternative body
$mail->msgHTML(file_get_contents('contents.html'), dirname(__FILE__));
//Replace the plain text body with one created manually
$mail->AltBody = 'This is a plain-text message body';
//Attach an image file
//$mail->addAttachment('images/phpmailer_mini.png');
//send the message, check for errors
if (!$mail->send()) {
echo "Mailer Error: " . $mail->ErrorInfo;
} else {
echo "Message sent!"; 
}
?>

Errors I receive is-

SMTP错误:连接服务器失败:(0)SMTP连接失败。https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting邮件错误:SMTP连接()失败。https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

我已经授权我的gmail帐户使用谷歌的不太安全的应用程序。是否有任何其他的变化，我需要在我的服务器或在php配置文件使这项工作?

注:我没有在我的服务器上安装任何东西，我刚刚从GitHub下载了PHPMailer并将其放在我的工作目录中。