Seeing high server loads on my new site

I have a couple of domains with Godaddy. I've never had an issue with them at all, either running vbulletin, or in any other aspect.

My original, main forum, the site was very fast.

I've been in the process of moving everything over to another domain, hosted at Godaddy, and the transfer went ok (everything works).

But the new domain has high server loads and the pages seem to load a good second or two longer than on the original domain.

I emailed Godaddy, and they said they see nothing wrong.

I'm on a shared plan now (the "deluxe" plan). Do I need to consider moving to a virtual dedicated plan? Is there something else I can do?

Thanks