Hi Ondra,
as in the title, in my opinion, the *.cbin file are too big, especially compared to *.vrmesh: near to be double.
Maybe you could add some compression on the *.cbin file.
For a small objects, you don't see the difference. But I'm going to render a big exterior and I have to create a lot of proxy tree (from 100 to 200MB every file)
So, when you have 20 trees, you can understand what I want to say: save memory and bandwidth for DR etc..
thanks