The software used on Pixelparity was YABB. And the reason it ran with lightning speed was not only the code itself, Peter kept it all in tip-top shape.

The two week downtime on PP happened was because the host re-configured the server - without letting anyone know. Peter also happened to be on vacation at the time.

However, rest assured that the board that Antony is working on (vBulletin) is every bit as good.