An accuracy of .00001 shouldn't be *that* bad for render times. max_gradient
may also be a factor; if you have it too large, that might slow things down
a lot.

You might want to extract a minimal isosurface object from your scene which
has this speed problem, show it to us, and let us see if we can increase the
accuracy without killing render times.

 - Slime
 [ http://www.slimeland.com/ ]

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