Regarding a starfield query in p.b.anim I noticed a peculiar
effect when using crackle at extreme scalings. The following
scene parses and renders in about a second at 640x480 (even
when just using a single thread) but then hangs for about 20
seconds before returning to idle mode. With scale .02 this
doesn't happen.

sky_sphere
{
   pigment
   {
     crackle
     form <1,1,0>
     scale .002
     color_map
     {
       [0 color rgb 100000]
       [1 color rgb 0]
     }
   }
}

I suspect the reason has to do with crackle cache hits dropping
from 99% to 20% so it probably bloats some internal data structure,
but it seems strange that freeing that would take so much longer
than building it in the first place. Maybe a case of O(n*n)? ;)

Tested on Win 7 64-bit with 3.7 beta 39 on an i7-970.

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