Which section was the fastest to run in the described workflow?

• A. Reading
• B. Transforming
• C. Writing
• D. Idle

Answer: (B)

In a workflow, the transforming stage is where the actual feature processing happens as data flows through the transformers. Once the data are loaded into memory, transformers apply attributes, geometry changes, filters, joins, and other operations in a streaming fashion. This in-memory processing is typically faster than waiting on external I/O, which affects reading (disk or network delays) and writing (flushing to disk or a remote target). Idle has no work at all, so it isn’t a processing phase. So the transforming stage ends up completing more quickly than reading or writing, making it the fastest part of the run.