How can I speed up the checkout process on my online store?

[HappytheHathi]

Hello 

Can anyone give advice on a free app for a quick checkout like checkout using facebook or an app that is a lot quicker. first on my store you have to add everything to the cart then sign up, then confirm the email address from your email and then you have to add everything back to the basket when you log in!

So long winded can someone help?

Thanks

Ruby