RoR ActionMailer：发送邮件时页面重新加载速度慢

I am new to RoR, have a registration page, with an "email" field. When the user registers a mail is sent successfully to his mail address but the problem is that it takes a while -about 6 - 10 seconds during which period the page is still reloading. Is this normal, is there an optimization option? any help would be appreciated. I'm Using ActionMailer Bundled with RoR.I am new to RoR, have a registration page, with