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All the preferences listed here, including the Render Engine preferences, are ignored during batch rendering (i.e. when using Maya Batch).
The Render Engine Tab
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Progressive Render
This options applies during normal renders only. It does not apply to Live Render (IPR); a separate rendering technique which is progressive in nature and allows interactive manipulations. For normal renders, when this toggle is turned on, the rendering rapidly starts with a noisy image and refines it progressively until completed. Progressive Render has a slight overhead and may increase render time in the order of 5-10%.
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