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Lock Bucket Size – Forces the bucket shape to a square by locking the region's W and H (width and height) together. Enabled by default.

W – Determines the bucket's maximum region width in pixels (when using Bucket W/H) or the number of regions in the horizontal direction (when using Region Count). 

H – Determines the bucket's maximum region height in pixels (when using Bucket W/H) or the number of regions in the vertical direction (when using Region Count). This parameter is available only when Lock Size is disabled.

Bucket Type – Determines the way the X and Y parameters are used to set bucket size:

Bucket W/H – The values for X and Y are in pixels.
Region Count – The values for X and Y determine the number of regions in the horizontal and vertical direction respectively.

Sequence Type – Determines the order in which the regions are rendered.

Top-Bottom – From top to bottom. 
Left-Right – From left to right. 
Checker – In a checker pattern. 
Spiral – In a spiral pattern. 
Triangulation –  Default, and usually the best choice, especially if you use a lot of dynamic geometry (displacement-mapped objects, proxy objects). This option walks through the image in a consistent manner; it displays information as it is calculated using the most efficient sequence for the current rendering settings, and uses geometry that was generated for previous buckets to render subsequent buckets. 
Hilbert – In the pattern of a Hilbert space-filling curve.

Reverse Sequence – Reverses the region sequence order.

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