> I wouldn't know, but you can try changing your function. There's another
> heart shaped function here, that reportedly renders very quickly:
> http://www.econym.demon.co.uk/isotut/real.htm (Yet Another Heart)

I have that now, and it's workable, but when I put it in my scene, I get a 
parse error.
His file renders correctly, so I must be doing something wrong, but I'm not 
seeing it.

Error is : Expected 'operator', ( found instead

#declare Bend=0.5;
#declare Sharpness=0.8;

#declare Heart = isosurface {
                            function { f_torus 
(y-pow(abs(x),Sharpness)*Bend,z,x,0.8,0.1) }
                            max_gradient 1.5
                            contained_by { sphere {0,1.5}}
                            }

//finally, the heart as an object
#declare MyHeart =
    object { Heart material  { M_Ruby_Glass }

                   #ifndef(NoPhotons)
                     photons { //collect off
                               refraction on
                               reflection on
                               target  1.0
                             }
                   #end

          }

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