Among other things, Zeger Knaepen saw fit to write:

> Rendertime is 39s... actually quite slow :-/

But is it always important?

I mean, let's guess this simple scene renders in 4 s without lens flares,
that means the flares add 35 s or ~900%.
If you have anether scene that takes 1 h (3600 s) without flares, would it
take 1 h 35s (3635 s) or 10 h (36000 s) with lens flares?

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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