It has happened a few times that technical issues were being solved by third parties at a moment when a user was making a purchase. At such moments the site was very slow.
If you experience substantial site slow-down in the check-out process:
DO NOT click the "Continue" button many times; and
DO NOT try to refresh the page.
If you still get charged more than you should have been, we will refund the excess amount. Although we notice that, we still ask you to send us a message through our Contact form.