Have you tested if there's any difference in render time between putting
all those 1000 rectangles into a union or separately in the scene?
  Povray may be able to make some bounding box optimizations with unions,
but I may remember wrong.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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