If you want to get a measure of the wastage, use the trick that's used in video editing - disable the Network Interface to your Internet connection temporarily. Time a render before and after, and see if the savings are worth disabling NI every time. Watch for caching effects though. You'd really need to run Poser from a fresh reboot each time, and do exactly the same steps - as Windows and Poser cache everything they can to save load times.