Forum performance is still poor. I am currently hosting the site on my dedicated server and my hosts are looking into this. The load doesn't actually seem that great on the server. But we are ascertaining whether a server upgrade is indeed the right course of action. As all my sites hosted on the same server including two vbulletin forums are responding find.

All forum modifications have been stripped back whilst troubleshooting is carried out.

Will keep you posted.

Dave