CmdID

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bitsadmin setpriority

Sets the priority of the specified job. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0
bitsadmin /setpriority <job> <priority>

To set the priority for the job named myDownloadJob to normal

bitsadmin /setpriority myDownloadJob NORMALIdentify
jobThe job's display name or GUID.
prioritySets the priority of the job, including: - FOREGROUND - HIGH - NORMAL - LOW