Work on very very large areas

Hi, I work with videos of large areas (50 to 400 hectares) that need large areas of vegetation. I currently have an I7 13700K processor, 96gb RAM and an RTX 3090 with 24gb of dedicated memory, which are fully used and also a good part of the RAM memory. Could anyone tell me if I would get big performance improvements if I started using DDR5 RAM? or what could I do to increase the smoothness of the work, since I’m getting an average of 3fps. DLSS an LOD are enabled.

Thanks for your advice about more 2D tree assets.

You can place some Backdrop planes in the far area.

works well for ground-level scenes, but not for large aerial shots: