If you don't make any more scene changes save your photon maps so they aren't
recalculated.

global_settings {
 photons {
  save_file "finalphotons.txt"
  // photon stuff
 }
 // global stuff
}

Use that for the preview then load_file for the final render.  You might
already have known about that.  I don't know if there's a problem or not with
mosaic preview and a saved photon map, just a suggestion.

Bob H.

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