Running simulations in Extreme speed is extremely memory-intensive. Depending on the machine, you may encounter issues with memory usage when running long simulations or working with large models.
During a long simulation (greater than 100,000 trials), you might also see that the machine’s virtual memory is being used. For example, you might notice that the hard drive is being accessed continually and the simulation starts to slow down. No message is given when this condition occurs. If such a slow-down occurs and it is absolutely necessary that additional trials be run, you can try to disable the saving of assumption values (see the Run Preferences, then Options tab) and then restart the simulation.
If you run an Extreme Speed simulation multiple times on a large or complex model, you might find that you receive the "Sufficient memory may not..." warning dialog. This dialog lets you disable the Store Assumption Values run preference and change the number of trials to run. Notice that these changes in the warning dialog reset those preferences in the Run Preferences dialog on the Trials and Options tabs. They are then applied to other models unless you reset them after the large model has run.