In the end I made 5 different bunches of grass. It is hard to see fully since I have my render turned down. (I render very slow)
I see you set in your Light Path settings the Transparency interations to 150… The problem with this well… look in my thread here.
https://community.gamedev.tv/t/rabbit-scene-progress/90820/23
I really recommend you to try to model a mesh with the grass leaves shape instead of having a square with transparency. Then you can reduce the transparency iterations to default (which is 8) instead of using 150.
Suffice to say that what took 17min render, reduced to 3 min using same Samples setings.
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