We have over 1,000 categories, with over 23,000 message boards. It will be a very large scale system, so some features have to be tweaked or eliminated all together to get it to work (elimination of the 'jump to' navigation, etc).
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.