If I render a picture at 800x600, that is 480,000 pixels.
If I render a picture at 800x450, that is 360,000 pixels.
The second picture is 25% smaller. Depending on the scene,
the scene will render anywhere from 0% to 25% faster. If
what you do has a lot of background stuff, like clouds, or
trees that you don't need to see the tops of, this can help
cut into the render time. If you have a single object that
you need to see all of, this doesn't help much.

Pascal Baillehache wrote:
> 
> > 2) it cuts about 20% of the render time out.
> 
> How can it reduce render time ?? I really don't understand what you mean !
> 
> Pascal

-- 
Mr. Art

"Often the appearance of reality is more important 
than the reality of the appearance."
Bill DeWitt 2000

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