Online ordering is going to occasionally have hiccups. You have to use a little common sense.

Always print your order confirmation page - doesn't matter if you're ordering from Performance or any other online retailer. If you don't have an email confirmation in a short period of time (10-15 min)- CALL the retailer and check to see if there is a problem-- especially if it's something you're needing by a certain date. If there is a problem you have the printed order confirmation page as backup and you can place the order over the phone if needed.