In order to balance I/O spikes temporally, it is intentionally indeterminable, and in fact, different parts of the map are saved at different times.
I
am truly sorry for all the crashes, though. I am embarrassed to say that almost all of the crash-causing bugs so far have been simple things which I really have no excuse not to have thought of in advance (and in fact, the kinds of things I usually
do think of in advance). On the bright side, the number of bugs in the server has decreased radically over the past two days. I thank you all for your patience in the matter*.
*
Though it should be mentioned that it has been worse. In the days of old, maps weren't saved at all except on orderly server shutdown and character data only on orderly logout, so a crash could easily result in days of lost progress. You guys nowadays don't know how lucky you are. In my days, we built our entire camps thrice over, in rain, snow and hail simultaneously, and we liked it. 