Currently I have a render going for over 1 day, only 30% done and it looks  
like this might take a very long time.
Is there anything I have done just plain incorrectly to cause this texture  
to be so slow, or is it simply the very nature of this texture? Any  
thoughts would be appreciated.

I am applying it to that snownut test object as a whole.

This is the slope texture I use for the high quality snow/ice. Here is the  
full usage:

slopeSnowTex(-1,0.9)

texture {
  SnowTex0
}
interior {
  fade_distance 2
  fade_power 3
  ior 1.45
  caustics 1.0
}

// slopeSnowTex.inc
//---------------------------------------//
//      Snow texture by [GDS|Entropy]    |
//                       Ian McDonald    |
//---------------------------------------//

#macro slopeSnowTex(_C_,filterVal)

#declare Snow =
texture {
  pigment {
   color rgb <0.96,0.97,0.99>*1.1
  }
  normal {
   wrinkles 0.4
   ramp_wave
   turbulence 0.3
   scale 0.039
  }
  finish {
   ambient 0.35
   diffuse 0.425
   specular 0.125
   roughness 0.1
  }
}

#declare Snow2 =
texture {
  pigment {
   color rgb <0.98,0.97,0.96>
  }
  normal {
   wrinkles 0.3
   ramp_wave
   turbulence 0.25
   scale 0.036
  }
  finish {
   ambient 0.325
   diffuse 0.4
   specular 0.15
   roughness 0.075
  }
}

#declare Ice =
texture {
  pigment {
   bozo
   octaves 1
   frequency 4
   triangle_wave
   color_map {
    [0.00 rgbf <0.98,0.97,0.96,filterVal>]
    [0.03 rgbf <0.91,0.97,0.93,filterVal>]
    [0.40 rgbf <0.91,0.97,0.93,filterVal>]
    [0.40 rgbf <0.91,0.94,0.94,filterVal>]
    [0.42 rgbf <0.91,0.97,0.93,filterVal>]
    [1.00 rgbf <0.91,0.97,0.93,filterVal>]
   }
  }
  finish {
   ambient 0
   diffuse 1
   brilliance 0.005
   specular 0.5
   roughness 0.001
   reflection 0.125
  }
  normal {
   wrinkles 0.1
   scale 0.00001
  }
}

#declare Ice2 =
texture {
  pigment {
   bozo
   octaves 1
   frequency 4
   triangle_wave
   color_map {
    [0.00 rgbt <0.98,0.97,0.96,filterVal+0.1>]
    [0.03 rgbt <0.91,0.97,0.93,filterVal+0.1>]
    [0.40 rgbt <0.91,0.97,0.93,filterVal+0.1>]
    [0.40 rgbt <0.91,0.94,0.94,filterVal+0.1>]
    [0.42 rgbt <0.91,0.97,0.93,filterVal+0.1>]
    [1.00 rgbt <0.91,0.97,0.93,filterVal+0.1>]
   }
  }
  finish {
   ambient 0
   diffuse 1
   brilliance 0.05
   specular 0.5
   roughness 0.001
   reflection 0.125
  }
  normal {
   wrinkles 0.1
   scale 0.00001
  }
}


#declare SnowTex0 =
texture {
   slope -y
   texture_map {
     [0.1 Snow]
     [0.2-(0.05*_C_) Snow2]
     [0.3-(0.01*_C_) Ice]
     [0.4-(0.133*_C_) Ice2]
     [0.5-(0.133*_C_) Ice2]
   }
   rotate -5*z
}
#end

Ian McDonald

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