Make 2D & Mesh Rhino 6

Hi there!

I‘m currently testing out the latest version of Rhino V6.
With the latest version of Rhino it should be possible to create a 2D line drawing from meshes.
As you can see in the screenshot I‘m currently working on an area, where I put some trees and houses in my model.
The problem is that all trees are meshes and it takes so incredibly long (after hitting 99% Rhino crashes constantly) to get a 2D isometrical drawing from that area because of the large amount of trees.
So i tried to convert all trees in polysurfaces, which didnt work out.
Do you know a way to make the trees more make 2d-friendly?

Thanks in advance!