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I've been wondering every now and then why the render bar progress is almost finished but rendered image on screen is far away being finished. Then the rest of it just pops out in an instant.

When rendering in Seperate Process mode (fastest) I find that the top half of the render completes and as you say the render progress bar almost completes and then the whole of the bottom half of the render pops up finished.

"You don't have to be mad to use Poser... but it helps"