There is a "-nographics" launch parameter used in some automated tests, but since that disables ALL graphics, including UI and menus, you probably won't get much use out of it as you won't be able to set up a game with it on user level.
Running an observer game on lowest settings on several clients at once is likely the only option for semi-quickly generating multiple late-game save states on user side.
Running an observer game on lowest settings on several clients at once is likely the only option for semi-quickly generating multiple late-game save states on user side.
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