Hi,
I was working on this huge project, and use a lots of CScatters.
https://forum.corona-renderer.com/ Pińczów Castle Reconstruction...
To have different plants with different distribution parameteres I used from 3 to 5 or 8 CScatters for single Distribution object.
If CScatters were not hided and I selected the distribution object or move to next frame I had to wait like 30s to 1 minute.