That's strange. I have experienced the exact opposite.
  For example this image: http://iki.fi/warp/pics/Radiosity_test2/rad1_2.jpg
took about 1 hour to render with pov3.1 at 320x240, radiosity recursion
level 2.
  The same image takes with pov3.5, with properly changed radiosity settings,
less than 10 minutes to render at 640x480, radiosity recursion level 4. The
result is practically the same (although the higher recursion level adds a
bit of illumination here and there).

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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