I am rendering animations of scenes that use fairly large image_maps
(somewhere in the neighborhood of 2.2 GByte, all told).  Needless to say,
these files require a significant chunk of time to load, taking up to about
a third of the total rendering time per frame.

Is there some way to tell povray that the scene's geometry and image_maps
aren't being changed for every tick of the clock and that previously loaded
data can be used?

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