Let's see the the problem from a different perspective: Povray 3.7 beta 31
almost stalls when specifying recursion_limit above 1.

My CPU is Intel Quad Core at 4GHz running vista. I rendered the above scene,
rad_def_test.pov, using the "Radiosity_OutdoorHQ" setting. As expected, 3.7
beta 31 was much faster that povray 3.6. But when i added the option
"recursion_limit 2", i get:

Povray 3.6: Total time 561.40 seconds.
Povray 3.7 beta 31: Total time 12960.69 seconds.

Yes, that is more than 23 times slower, despite the fact that 3.7 used all four
cores instead of one. I am sure i used the same rendering settings in both
versions:

512 x 384 +A0.3 +AM2 +R2.

The output images were identical.

Maybe this is a bug.

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