I am starting to mess around in UE5 and testing out Lumen. First thing I noticed is that a fresh scene tanks my framerate.
I tried to build a small forest scene with nanite and some trees/foliage, which I already optimized with LODs.
When I run the GPU Visualizer, I get this result
The Diffuse Indirect and AO seems to be really costly
I already optimized shadow maps, but as you can see from the GPU ms that’s not nearly enough.
The question is what can I do to optimize this to something actually playable…
Other useful info:
I have basic Lumen setup, with 1 directional light and 1 skylight. 1 Volumetric Cloud.
A few Megascan assets, and the birch trees assets from the marketplace (with heavily reduced LODs).
Here are my project settings (that I messed around with)
Intel(R) Core™ i7-10700K CPU @ 3.80GHz 3.70 GHz
AMD Radeon Pro 5700 XT
If this topic is useful, I hope it will help others like me, who are new to UE in general, but who also want to learn the new tools as they become the new standard.
I love Lumen and Nanite so far! I hope I can get them running properly on my machine.
By changing the Engine Scalability Settings, towards the high-medium, for the first time I saw all the ms and framerate go in the green. But it still dips in the yellows when I put a character and start moving around the scene.
Material quality is low.
Engine Scalability Settings for better performance