Any problem can be solved faster! *CONTROL_SUBCYCLE allow use different explicit integration time step for different FE model zone . This feature allow significantly reduce simulation time. You can read more about subcycling "Current Status of Subcycling and Multiscale Simulations in LS-DYNA" by Thomas Borrvall, DYNAmore Nordic AB; Dilip Bhalsod, John O. Hallquist, Brian Wainscott Livermore Software Technology Corporation (LSTC)