Okay, I'm now using the decimate if above option and it seems to take a few seconds to calculate which is a good step forward, thanks for the tip AbnRanger ! I was thinking about decreasing the level of details of the object to be less than a million tris, using the autopo and then baking the fine details from the original hi-poly object using normals, the only thing is that I'm now getting a "The model is empty" error message once the autopo is completed; I've tried different models with different resolution with no luck.. (Never happened with the V4) (Riddell: No red info on the bottom status bar so far)