Send Mail XAMPP Windows

[wget]

So, I just wanna make sure this is correct because either their is a long delay in sending the email when users register on the forum or something is wrong with my php.ini and my sendmail.ini

My php.ini

SMTP = smtp.gmail.com
smtp_port = 587
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"
mail.add_x_header=Off

I'm not sure what the "\" is before the path to where the sendmail.exe is located but I added that because everyone else appears to be using it.
The part where C:\xampp\sendmail\sendmail.exe is the correct path to where sendmail.exe is located on the server.

I'm not sure why we need a \ after sendmail.exe but added that anyways.

By the way that's the only part of php.ini I edited the rest is still in the php.ini that's just the changes I made in my php.ini.

Now as for my sendmail.ini I have this...
smtp_server=smtp.gmail.com
smtp_port=587
smtp_ssl=tls
error_logfile=error.log
debug_logfile=debug.log
auth_username=[email]@gmail.com
auth_password=[email password]
pop3_server=
pop3_username=
pop3_password=
force_sender=[email]@gmail.com
force_recipient=
hostname=smtp.gmail.com

Obviously I edited the auth_name and auth_password to my gmail email and gmail password.
But is their a reason why it takes so long to get an email is their something I need to edit to speed up the delivery time for users to get their activation link?