I've recently rendered a 342 frame animation of my Disco ball
with photons.  I used -D (display off), but still got the speed
decay that you talk about, and found the only solution was to
keep stopping it and running subsets. 

"Greg M. Johnson" wrote:
> 
> 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...

-- 
Cheers
Steve

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