Hello guys.
I have a big performance problem if im try to sculpting and painting my landscape.
I have an automaterial and edit layers are on.
If try to sculpt or painting, my editor has a massive framedrop and sculpting is a very very big pain.
Did someone has ideas how i can avoid this?
You see that red flashing message top left? 
I don’t know if it’ll help, but try increasing the streaming poolsize with the console command
r.streaming.poolsize 4000
( or something similar )
Yeah i know, but this effects the landscape performance?
Well, try the command and find out 
If you scroll this topic, you will find what is destroying your performance.
[Tech Note: Landscape Edit Layers Issues]
The reason you are lagging is because you have set AI up in your scene and you used the navigation bounds to capture the playable area. This means any alterations to the landscape means it has to recapture the navigation data. You can fix this by deleting the bounds and only putting them in when your mesh is close to finish.
We’ve ran into this issue before so I’m speaking from first hand experience.
The reason you are lagging is because you have set AI up in your scene and you used the navigation bounds to capture the playable area. This means any alterations to the landscape means it has to recapture the navigation data. You can fix this by deleting the bounds and only putting them in when your mesh is close to finish.
We’ve ran into this issue before so I’m speaking from first hand experience.
I delete all nav bounds volumes but the problem is still there. But this was a good idea.
If you scroll this topic, you will find what is destroying your performance.
[Tech Note: Landscape Edit Layers Issues]
I found the post, this means, that they will fix the edit layer problems with a new update?
The post is only one day old, so its very up to date. This is a good news.
I hope so. Problem is render target memory and resolution. For 4k map landscape brush allocates up to 8 high quality render targets with min. 100mb memory size on gpu (you can check textures in landscape brush). When you paint each of this render targets need to be updated on tick(when you trying to paint), 800 mb of memory or 4096^2*8=134,217,728 pixels…
in 5.1 when you dragging water spline it will not show updates, after drag it will be updated → this way it works at 4k resolution. But problem that you need to see sculpt in realtime… you can’t freeze update until drag is done. I hope they will solve this memory problem, for example create small local render targets for each landscape component (updating them will be much faster and responsive) and after paint merge them to final target texture (still freeze for a 1-2 sec but whatever)
Sounds like you have the same problems.
Did you have a workaround to work with this or did i have to pause my sculpting until this updates releases?
Depending on how your landscape is set up you could go into reduction settings in the landscape mode and try reducing the complexity of the landscape. This will give you more interpellation errors depending on the height differences between two vertices but could definitely speed up performance.