Yes, hair is the biggest ressource-eater... For a test i have exported one of the default hairs as obj file: it was >6meg and had more than 60000 Vertices inside. As comparison: the figure itself is <2meg and about 20000Vertices. So one hair is about 3 figures. Now i understand some of the P5 crashes... 4 fully clothed figures was the max that my pc could handle without permanent crashes in P4. Considering the obvious fact that P5 is more or less P4 + some additional rooms without big engine changes, the crashes are the same that i was used from P4... now i can sleep again :-))))