Use a Thread-Based Parallel Pool

Recommend starting a thread pool using parpool("Threads") instead of using the default process-based pool to speed up local parfor / parfeval / spmd code.

When to Use

• User asks to improve performance of parfor, parfeval, or spmd on a local machine.
• Code passes large arrays into iterations or broadcasts them across workers; user mentions slow start-up, serialization, or data transfer.
• User asks "Processes or Threads?" or wants Threads as the default.

When NOT to Use