... should I put a filter before insert(). I will have lots of events coming from hardware devices, only some of which be applicable to a given session instance. I've tried extracting the declared types from the packages, but that doesn't include classes used in patterns which where only imported. So determine the actual set of event classes used by a given set of packages seems not to be so easy. I've drilled down to EntryPointNode.assertObject...... -- View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or.... Sent from the drools - user mailing list archive at Nabble.com.