I've noticed that time to write slice files seems to be slower. To be clear, I'm not talking aobut calculating the slice. I found the option concerning Volume calculation and turned that off already. I'm talking about when it's done slice calculating and I click save. Since moving to 1.6.5 it's much slower. I downgrade to check and one of the models I have a STL of it took about 45 second to save in the 1.6.3, but 2 minutes and 5 second for 1.6.5.
Not the end of the world. But it's an odd things.