Alright here are some benchmarks from my side. This is Nanite-Only, as i have no time manually optimizing 300 Meshes.
The scene is rather small, compared to an open world, as this was a VR escape room puzzle we did for fun a while ago.
It is using full photogrammetry assets, 8k Textures and a lot of foliage.
The full scene has nanite enabled, except the skybox. Real Time VSM. No Lumen.
The detail you can achieve with nanite is beautifull. Especially for a VR Game, peoples jaw dropped when they first played the demo, as you can literally go right up to the meshes, and they still look detailed. We are using super dense foliage meshes and tessellated landscapes. We also have WPO animated leafs and particles. So not the ideal use cases for Nanite.
The foliage and leafs also introduce quite a bit of overdraw, which is not ideal and could be optimized.
On the other hand, you can look at earch individual leaf, as it has geometry!
Okay, now after i apply all optimizations (including TAA, DLSS, console commands to adjust quality settings) we get the following profiler stats:
The Nanite VisBuffer is the biggest chunk and sits around 1.8ms.
This is consistent across hardware. We barely noticed an increase when switching to lower end systems. What does change is the Shadow Depths and the rendering.
So OFC there will be less FPS on lower end systems.
Right now, we are getting 180-200 FPS with a frame time of 5ms.
On my Laptop (3050, 8 core, 3.8GHz) the frame time is ~8ms, so ~120FPS.
This is about the same when running the game in a standalone build.
Running on my Quest 2 with PC link i get ~6.5ms frametime with a VisBuffer of ~2.5ms.
For a VR Game, that requires 90FPS, this is absolutely playable and in Budget.
And while next gen graphics are absolutely demanding, the leap you can achieve with Nanite is incomparable to manual LODs.
Also it is important to notice, we did this project in one week with 3 people. This includes everything! The Programming, downloading the assets (which took a day), building the level, optimization. The quality we achieved in such a short amount of time would be impossible without nanite.