We continue working on this, but until now it was not possible to reproduce the problem here. I guess or it's completely random or happens only under certain conditions.
Well, i found something interesting :
- I have put all forest objects on separates layers,
- I have turn off all of them and the problem disappeared,
- I have turned them on one by one to isolate the forest object wich make 3ds max bug, freeze the time line and increase the time to save the file,
- I have four différent Forest objects that make it slow and all of them are Lawns or Meadows presets (Cut grass field 02 large / Daisy01 large)
The variation of global density doesn't work for those object but affect all the others (global). It's ok with proxy and decrease Max items in viewport instead.
Please, would you double check that Global density doesn't affect to those objects ?
To check it use a Top view, not a Perspective. Far objects would see more dense than they are, because there are more items together (although with few dots by item).
Also it would be interesting to test turning off
Camera->Auto assign to active View and unlinking the camera if any (click
Camera->Clear). That would give a us clue if the problem is caused by a continous updating issue when camera moves. This can be applied easily to all Forest objects using
Camera->Copy Parameters.
Thanks,