Gary Stofan
Ansys Employee

 

DMP calculation is generally faster for the numerical calculations and is the default recommendation. 
A drawback to DMP can be the amount of time it takes to merge result files. This result file
merge time is often small compated to calculation time of large modes that may take hours or days to solve.  
This is why it is important to have fast disk systems, usually SSDs or HPC file systems.

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There are two really good sections in the Ansys Help that I consider prerequisite reading when you get some time:

   Mechanical APDL > Performance Guide   Performance Guide (ansys.com)

 

   and

   Mechanical APDL  > Parallel Processing Guide.  Parallel Processing Guide (ansys.com)