Hello,
How long is the duration of the drilling? How many seconds? We simulated a screw in wood that lasted 2.4 seconds. You can use the following strategies to speed up the calculation:
- Increase the density of the rock.
- Limit the SPG domain to only where you need it (see image below).
- Use *CONTROL_MPP_DECOMPOSITION_ARRANGE_PARTS so distribute the SPG part to all processors.
- Run the calculation on a cluster using MPP LS-DYNA with 32, 64, or more processors.

Let me know how it goes.
Reno.