This is just a quick test I did, so there might be other figures that will give these problems, but you have to test that out yourself.
If I load the figure Topmodel Updo Hair, you will see in the scene panel that some of the geometries are hidden. It comes with shape presets so with 1 click these geometries turns on and off. Pretty smart.
But what my test is showing is that these geometries that should be invisible will still load in Octane and have an effect on render times, VRAM, and the known intersecting problem.
To compare I exported the hair out as an OBJ file and imported it back into Daz. Both are rendered without textures and materials with the same rendering settings.
First image is the hair loaded from Daz's content panel.
Second image is the imported OBJ of the hair.
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