...

Procedural Reentrant: This allows procedurals to run simultaneously in multiple threads and greatly speed up renders with procedurals (hair). You most likely want to leave this on.

Output Shadow AOVHoldout Matte: When using the Holdout workflow, output the Shadow AOV to this specified buffer.

Enable Image Plane Filter: Render the image plane using the Pixar Image Plane Filter (Maya uses an actual geometric plane)

Adapt All: Apply the sampling quality criteria (pixel variance) to all color/illumination AOVs. This can increase render time as some AOVs may have more noise than the Beauty and trigger more samples through all the AOVs.

Adaptive Sampler: Make use of the improve sampling algorithms instead of the default. You may need to slightly increase your Pixel Variance setting to avoid longer render times (but better resulting quality on complex images) Your min samples should be set to 0 which has special meaning that the square root of the max samples is used. If you manually input a low value, it will terminate early.

...

• "world" (default) uses the true world origin
• "worldoffset" use user provided trace:worldoffset as the raytrace world origin ( the control will expose an XYZ coordinate field)
• "camera" use the camera position as the raytrace world origin, you may wish to use this in large scenes with multiple camera positions as the default.

Crop Window

Enable: Use the crop window, off (default) renders the complete frame based on camera settings

...