Hi Restif,

I have sometimes the same problem as you with the hair, the computer freeze or doesn't pass well from a room to another after a simulation.

My personal experience makes me say that when a file of simulation “is rotted”, it is necessary to start again another (not all the project, but to replace new hair, in this case).

I also know that when a scene is very loaded in simulations (bullet, Hair, particles), it's preferable to create each one of them in a separate empty project and then to import it in the principal project when this simulation is OK (via your objects library).