What are sections?

[T_D]

Just one more consideration. The low section count is especially important in lower resolution LODs, because these are the ones you will have in masses in a scene at a time. You rarely see more than 3 first LODs at a time. Maybe that's why BIS can accept a lot of sections in first LOD sometimes. But I am pretty sure it is very low in low LODs

[Double Doppler]

Thanks.

Which feature affects FPS more: section count or texture size/density?

[Baraka]

Should be the section count. Of course, when you use 2048x2048 for every stone it won´t tune up the fps

[Max Power]

Thanks.

Which feature affects FPS more: section count or texture size/density?

It is generally better to have one large texture map instead of several small ones.