We're experiencing problems with the Large Object Heap and NHibernate. We have a combobox that's bound to a user class. Whenever we retrieve all users in the system (approx 6,000) the LOH grows by approx. 10mb. If we limit the number of users being retrieved the LOH doesn't grow at all.

My question is, is there something NHibernate's doing internally with the records before it creates each individual user object that would cause large objects to be created? For example, storing all of the records in a byte array then building the user objects?