How much more specific do I need to be? Try opening one of Andi3d's Cloisters pz3 scenes, and see how slowly it responds. I don't know how much more detail I can provide that I haven't already above. Two Carrara trees, some Anything Grows grass, and a couple of very short arched hallways shouldn't respond as though I had loaded all of Dystopia into one file, IMHO. The only Carrara log on my Mac is the crash log, but those logs record the status of a program and its relationship with the Mac at the point of a system/software crash. Carrara doesn't crash in these native import instances, it just moves very, very slowly.