The whole point of the vramesh is that it is instanced; if you have 100 identical trees that are copies instead of instances it will have to load each one into memory independantly, rather than re-using the one that is already in memory.
The whole point of the vramesh is that it is instanced; if you have 100 identical trees that are copies instead of instances it will have to load each one into memory independantly, rather than re-using the one that is already in memory.