Find how many verifications before they clear and refresh blockchain instead, at least you take away a bit of load from the DNM servers, because i can guarentee right this second there are multiple people sitting at there pc spamming the refresh to get their order in.
A refresh will do nothing. A refresh is like 0.0000001% of a DDoS attack. Even if every user did refresh the page, it'd still only be like 0.0001%.