Certain combinations in a scene are sure to kill render speed, even with 
multiple cores. In a scene I am working on I am using radiosity, focal blur, 
and a (blurred) object with media containing scattering, some emission and 
density. When reaching this particular object, the render drops down to a 
crawl on my two core machine (using 3.7 beta 34). Maybe you have some smart 
advice to give in order to boost up the render a bit? Here are the code 
details:

Radiosity:
      brightness       1
      count            100
      error_bound      1.0
      gray_threshold   0.0
      low_error_factor 0.4
      minimum_reuse    0.015
      nearest_count    1
      recursion_limit  2
      adc_bailout      0.005
      media            off
      normal           off
      always_sample    off
      max_sample       1.0
      pretrace_start   0.08
      pretrace_end     0.004

media in object:
  interior {
    ior 1.45
    media {
      intervals 1
      samples 10
      scattering {1, rgb <0.2, 0.1, 0.1>}
      #if (BallDensity)
        emission <0.01, 0.01, 0.1>*0.5
        density {
          spherical
          color_map {
            [0.0 rgb <0.0, 0.1, 0.2>*0.15]
            [0.5 rgb <0.4, 0.4, 0.2>]
            [1.0 rgb <0.6, 0.6, 0.3>]
          }
          scale 1.5
          warp {turbulence 2}
          scale 0.9
        }
      #end //of BallDensity
    }
  }

As focal blur I use Edouard Poor's 35mm camrea macro with the following 
settings:
  Camera35mm_SetFocalSamples( 100 )
  Camera35mm_SetFocalVariance( 1/10000 )
  Camera35mm_Autofocus( CamLoc, CamEye, 38, 50, CentralObj )


Hope this helps to get an idea. Thanks for any advice.


-- 
All the best,

Thomas

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