What makes adding new class attributes such a time-intensive operation, is that for each object attribute of that class attribute some datatype-specific methods need to be called. Too much object-oriented coding kills your database.

For the majority of datatypes, the initialization (initializeObjectAttribute() method) of attributes, consists only of setting a default value, or is even not doing anything at all. While when creating new attributes in plain SQL we could have the same effect, but much much faster... INSERT INTO ezcontentobject_attribute ( ..., 'field_where_default_value_needs_to_be_in', ... ) SELECT ..., 'default_value', ... FROM ....