That phenomenon was reported some time ago.
I am not sure if it can be fixed, but it is
worth it to see what you need to remove to
get it to go away.

I heard it is more efficient to show main
face and let that update all the faces,
rather than update each face separately.
That is, I would use one engage function for
time events:

        main/feel: make main/feel [
                engage: func [face action event][
                        if action = 'time [update-objects]
                ]
        ]

        main/rate: 48
        show main ; update rate

In update-objects, I would maintain some counters 
to update the various objects you have in the scene,
and  show main  at the end.

Anton.

> Hi Anton,
> 
> I have the same saw phenomenon on my PC, but i don't know the origin.
> The titre2 variable is perhaps too long ? But after cutback the 
> trouble is always present.
> The origin is perhaps the draw fonction ? I replace it with these 
> lines but i don't resolve the problem .
> 
>  scro: image s3 effect [key black] rate 40 feel [
>   engage: func [face action event][
>    if action = 'time [
>     scro/offset: 290 + to-pair reduce [
>      to integer! p
>     ]
>     show scro
>     p: p - 3 // 15000
>     q: q - 2 // 360
>     
>    ]
>   ]
>  ]
> 
> Have you a idea ?
> 
> Thank.
> 
> Jacky
> 
> 
> Very nice.
> Here's the direct link:
> http://www.agora-dev.org/forums/getfile.php?key=1065244177&att_id=
94&site=re
bol&bn=rebol_prjevolutions

I saw a slight, but regular, delay while it is
playing. I'm on WinXp 933MHz Pentium 3.

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