There is a hidden feature in R19.2 (soon to be released): After typing… (enable-feature ‘dpm-hybrid-workpile) Doing this will add a new check-box “Hybrid Workpile” in the “Parallel” tab of the Discrete Phase Model panel. Check it and run some iterations / time steps so that a DPM iteration is done and see whether it helps. To diagnose the efficiency of the utilisation of the CPU resources, type the following into the TUI window at the prompt: (rpsetvar ‘dpm/verbosity 3) (dpm-parameters-changed) Run enough iterations / time steps to get through at least one DPM iteration. Note that this diagnostic can have a small adverse effect on performance, so you may want to switch the DPM verbosity back to 1 once your tests are complete.. (Remember to issue `(dpm-parameters-changed)´ again for the change to take effect.) Also, the speed-up it may contribute depends very much on the individual situation, involving both the simulation problem setup and the hardware configuration used.