Thanks for the comments Forgeron and Clipka.  I didn't think there would be such
a massive change in render times!  Without the parametric surface the scene
renders on my laptop in a couple seconds.

I lowered the quality and got a quick render-time again.

The surface isn't supposed to be that blob, it's supposed to be a small tube
around a hyperbola... It looks like I don't understand how PovRay "functions"
work... but that's something that I should be able to sort out.

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