Kenneth wrote:

> OBSERVATIONS:

you may be overcomplicating the situation a bit. It appears that

1. The first frame rendered determines whether to use bounding
    for all frames (this is a bug or design flaw, IMHO)

2. If bounding is disabled, frames with many objects render slowly
    (this is to be expected)

There is nothing magical about "adding" objects between frames.
An animition is almost rendered as if each frame were a separate
scene, with some automic values for variables like clock, special
output file names, and apparently an unfortunate persistence of
the predetermined bounding setting.

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