Which statement best describes when to remove unneeded attributes and geometry to optimize performance?

• A. As late as possible
• B. As early as possible
• C. Always before any transformation
• D. Never remove attributes

Answer: (A)

The idea being tested is to remove unneeded attributes and geometry as late as possible, meaning you drop them only after the last transformer that depends on them has finished using them. This ensures every step in the workflow has access to the data it needs to perform its work, reducing the risk of breaking downstream transformations or having to re-create attributes later.

Carrying attributes and geometry through more of the pipeline can make the processing heavier, but removing them too soon could force you to reintroduce or recompute data later if a downstream step still needs it. By timing the removal just after the final use, you preserve correctness and stability while still limiting the final amount of data carried toward output, which helps overall performance and avoids unnecessary rework. In practice, you identify where each attribute or piece of geometry stops being needed and place the drop right after that point.