I just rendered it with:
photons { spacing 0.01 }
#declare Tex2 = material {
   texture {
     pigment {rgbf <0.5,0.7,1.0,1.0>}
     finish {
       conserve_energy
       reflection 0.5
     }
   }
   interior{ior 1.2}
}
global_settings {max_trace_level 25}

2000 blob components. Photons are barely visible, and took only 19 
minutes. However, with reflection{0,1} I manage to reach the "pixels per 
minute" scale!

I'll try your material now.

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