Server specification for running one of your themes

Hi
We are seriously evaluating your tools for a new service we are thinking of offering and are trying it out on this test site.
The most important thing is "Upfront" as its very impressive and stops clients being idiots.
But we are having issues with the resources it uses on our servr. We have our own development server that we have this running on and our hosting partner tell us this site is taking a huge amount of processing, ie over 400mb over the last 24 hours.
I have attached a report on what's happening.
So is there a minimum spec you recommend or do you know why it is very hungry
Thanks
Barry