Not true for non-interactive simulations, some of which e.g. as used in Systems Biology, choose the time-step to the next event from a probability distribution.

Not true for non-interactive simulations, some of which e.g. as used in Systems Biology, choose the time-step to the next event from a probability distribution. That is a huge speed-up compared to a fixed time-step simulation in which you choose whether or not an event occurs in the current time-step randomly. https://en.wikipedia.org/wiki/Gillespie_algorithm https://en.wikipedia.org/wiki/Gillespie_algorithm