[Cin] Seconds to preroll render

[Phyllis Smith]

Andrea, still it would be useful to make a note in the Manual so I will do
that unless you would rather do that yourself?  It seems to run in reverse
more consistently for me and not as jerky - although my test only had 1
video effect added.

I have to scale back my enthusiasm. With Further Testing I don't get
> much of a boost, especially if there are effects and transitions.
>
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