1. If a light source doesn't produce visible soft shadows, then by all means
make it a point light.

  2. With all area lights you really need, use an adaptive value as small
as possible (start with 0 and see if there's any visible artifacts; if there
are, try with 1, and so on).

  3. Convert as many of your lights to spotlights as possible. Usually all
light sources in ceilings/walls can be converted to spotlights (use the
tightness value to get the proper fading; the default value might not be good
in many cases).

  4. If you are using pov3.5/megapov, use light_groups to limit the number of
objects which the light source has to be tested for. Usually a light source
only lits the room it is in (and sometimes attached rooms if there are
windows connecting them).

-- 
#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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