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when I try to load big scene and if data not fit to memory, I have red message nvpro_core\nvvk\memallocator_vma_vk.inl(142): Vulkan Error : VK_ERROR_OUT_OF_DEVICE_MEMORY and program exit.
when I try to load same scene with vk_raytrace I have many messages "downgrade memory" but scene fit to memory and render continue work and renders ok.

nvvk::DeviceMemoryAllocator works better vs vma.
How to switch memory manager to nvvk::DeviceMemoryAllocator?

I'm using an NVIDIA RTX 3090 and Intel i9-10900X CPU and I don't understand how can I have higher FPS with ray tracing.

Using the FPS and frame generation time on the top I average around 1000 FPS / 0.9ms using ray tracing, but in raster I get around 430 FPS / 2.3ms without any super sampling multiplier (ie. no AA).

Also I tried using my own timer for the raster and ray tracing function and I get around ~0.2ms for ray tracing, and ~0.4ms for raster.

For reference here are my scene stats:
Instances: 120
Mesh: 120
Materials: 99
Triangles: 7858115
Lights: 0
Textures: 104
Images: 68
4k environment map.

I have nvidia 3060 laptop and with default scene I have 85%-95% of GPU usage.
Why speed is variable?
When I try run on nvidia 4090, I have 25% -35% of GPU usage.
How to use 95% - 100% of GPU in RTX mode on ANY GPU?

I'm trying to load Sponza Base Scene
OpenHardwareMonitor.exe shows 5964.2 mb of VRAM usage
Windows resource monitor shows 5,7 gb usage
but NVML monitor shows 6.25/6.44 gb usage
and program aborted - out of memory