Has the cause of render speed decay been identified as having your
preview window open?  In Win98, will closing it solve the problem?

I have an animation of 375 frames.   I am reading an INC file with 375 *
50 * 6 numbers, which are the positions and velocities of 50 actors.
There are 1200 objects in the scene (50 actors' last 24 positions).  I
left it render last night.  When I got to it this morning, on about the
75th frame, it was taking  7 minutes per frame to render!  I stopped it
and started it again at the same frame: 7 second renders.  It did 100
frames before I realised we had no milk in the house for breakfast!

BTW, the parsing time was insignificantly different: constantly around 4
seconds, due to my use of an INC file instead of recalculating the whole
matrix for each frame. Thanks to John vS for tips...

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