Hi,
I just checked C4 L2OFF (the original one from postpacific), and it seems it has a different Id generation system for each entity.
So far L2OFF generates different ids for the following entities:
Splitting the current id generation to these entities will improve the performance a bit, since the most consuming "task" to generate/maintain ids are the item entities.
I have doubts about character id and creature ids, I dont know if they can be splitted as well.
Greetings.