You can start xcopy directly, for example start xcopy [parameters] . This allows you to run many xcopy instances in parallel.
By the way: Have you tried robocopy? It is included in all recent versions of Windows and offers more features (and sometimes performance) than xcopy.
But in general, copying multiple directories in parallel is slower (at least when you copy from disk to another disk) because it will cause the original disk to search between parallel copy jobs instead of reading files sequentially.
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