Remember tutorials are intended to run on pretty much anything so tend to have coarse mesh and other features to aid in rapid convergence.
However, DPM is Lagrangian based, so behaves a little differently. If you look in the parallel tab the load balancing has options for mesh (used by all models) and other physics. If you look in your model, most parcels will be on fewer partitions, so some cores are working harder than others.
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