When trying this, keep in mind that your HW should be able to to this in a reasonable manner. Starting up the parallel processes will take time and resources, and when those processes compete for resources (CPU cores, RAM, disk access), they may actually slow each other down so that the final result is worse (slower) than simple processing in succession. A process that runs for 2 minutes and is repeated 10 times takes 20 minutes, but running the 10 processes in parallel may easily take you more than an hour, if your server is not designed for parallel work.
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