Hi Michel,
I’m testing on 4.18 now.
Here are my landscape settings:
https://i.imgur.com/ikZBm9a.jpg
Here’s the cost on GPU, around 8ms.
https://i.imgur.com/klzI1BH.jpg
Here’s the cost on GPU with a single bush (around 170 tris per instance), around 23ms.
https://i.imgur.com/SMSFWR8.jpg
I’m running a GTX 970 at 1080p.
Please note that while the landscape is 1x1 Kilometers, the grass is being spawned only on small circle around the player and is not covering the entire 1x1 Kilometers. Also there are 64 components total but there isn’t grass on all of them as you can see.
The massive performance cost is still coming from shadow depths as soon as grass node is used.
Also please notice that we’re dealing with only 1 mesh here where in outdoors we’d need many different pieces linked to the grass node.
If you need any additional information please let me know.
Thanks.