When persistent Lists get bigger, the PersistentBag.equalsSnapshot becomes significantly slows down Hibernate queries (with FlushMode.AUTO).
The implementation of this method calls countOccurrences and that calls ComponentType.isSame N* ( 2N ) times . When where N is number of items in a collection has 200 items, then countOccurences is called 80 000 times and ComponentType . isSame several million times. Since isSame uses reflection, it's quite slow.
I think there is quite simple optimization that can be made here. I will prepare a contribution for this.
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