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The System rollout gives you access to various parameters including those that control V-Ray's rendering regions (buckets). The bucket is an essential part of the distributed rendering system of V-Ray. A bucket is a rectangular part of the currently rendered frame that is rendered independently from other buckets. Buckets can be sent to idle LAN machines for processing and/or can be distributed between several CPUs. Because a bucket can be processed only by a single processor, the division of the frame in too small a number of buckets can prevent the optimal utilization of computational resources (some CPUs stay idle all the time). However, dividing the frame between too many buckets can slow down the rendering because there is some time overhead related with each bucket (bucket setup, LAN transfer, etc).

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