The "razor trees" are an inherited problem, rendering forests with acceptable frame rates and the buildings/town/cities, will never be fixed unless they are removed/replaced,
adding extra textures to forests will slow the sim down further still, the "razor trees" were done that way for the reason of keeping frame rates fast low down.
I remember the introduction of the new palm trees around the time of Pacific Fighters, it was a complete frame rate killer and still can be on certain maps.
If its a choice of time being used by
DT between a scenery
or aircraft simulator, I would go in favour of the aircraft every time.
Unless you have some reworked textures you have made yourself already tested and ready to go.
.