Apologies for the slow response from the website over the last week or so!
<tech babble>
I've been trying to get SpamAssassin working to clean up the amount of spam we get through our mail server, and this has caused some issues when doing dns lookups as it has been timing out and causing extra/unneccessary server/network load which in turn increases response times. </tech babble>
It's now sorted and the site is back to being lightening fast again!