Actually povray can optimize a bunch of spheres so that they will
render faster (by defining bounding box hierarchies).
  20000 spheres will not take twice as long to render as 10000 spheres.
I haven't measured, but I would guess that the factor is more close to
something like 1.1 or whatever.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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