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The Interactive renderer always runs in Progressive mode, an image sampling mode that progressively refines the image over time. The Production rendering mode switches between Progressive and Bucket image sampler. Unlike the Progressive image sampler, the Bucket one takes a variable number of samples per pixel depending on the difference in the intensity of the pixel, as result the image is rendered on small square portions (called "buckets"). 

Use V-Ray Swarm distributed rendering system or render in Chaos Cloud, as a complement to or a substitution of your usual render workflow.

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