Hi Andrew,
I think you missed my point. I was talking about the Grass node behavior, not the landscape. I’m NOT experiencing any performance drop coming from the landscape. I’m putting together another test for you below.
1 Component = 120 FPS
http://uupload.ir/files/ocjt_00.jpg
Grass Type linked to Grass Node inside material editor = 120 FPS
http://uupload.ir/files/r3cx_11.jpg
100 Components = 120 FPS
http://uupload.ir/files/xgt2_22.jpg
Same Grass Type linked to Grass Node inside material editor = 53 FPS
http://uupload.ir/files/5hhm_33.jpg
So basically Grass node has a problem which is tied to the number of landscape components. Landscape alone is fine.
Does this now help you to see the issue more clearly?