Perhaps I'm not understanding the media sampling parameters quite right, 
but here goes...

I have a block like this:

interior
{
   media
   {
     scattering {1, 1}
     density {Fn6(x, y, z)}
   }
}

This is supposed to be the clouds for my sky (which takes up about 50% 
of the image with the current camera angle). It renders at about 3,000 
pixels/second.

Now, if I add "intervals 10" (or indeed, any other setting) the render 
slows down to 1,800 pixels/second. And yet, the documentation claims 
that 10 is the default value... Does POV-Ray do something special if no 
explicit value is given or something? (The images produced are markedly 
different as well by the way.)

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