With the demo at 30 fps, A7 renders when I set the #defines to only one sort of entities:

either 63000 tree models with 400 polys each - 30 fps

or 81000 grass sprites - 30 fps

2500 are visible, the rest is clipped, so the grass sprites render faster than the tree models.

BUT: When I add 500 panels I get less than 20 fps!! And when I scale the trees bigger, less than 15 fps!!

Conclusion: entities that are not visible need almost no render time. When they are visible it depends not so much on their polygon count but also on their size how fast they render.