If the device performs a series of small related events, it is desirable to cluster these events into larger chunks, even if the simulator cannot respond immediately. For example, in a DMA transfer, rather than moving a few bytes every single cycle, the simulated device can move a whole memory page at a time every N cycles, where N is adapted to give the same overall transfer rate. Again, this means the model is invoked fewer times, and furthermore it will trigger other devices less often, too.