speed up registration process

hello everyone,
I currently develop a registration algorithm using itk framework. Everything seems to work well, except that execution time is very long, especially metric computation (as expected). I have one question: is the registration process multi threaded? More specifically, I do not understand what WorkUnits are? Are they similar to threads?

Registration is parallelized. In Wikipedia article on thread pool, WorkUnits are called tasks.

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okay, thank you for the info @dzenanz