Problems with the existing savegame format:

- they are big
- they are many
- they are disconnected from rulesets, giving errors or undesirable behaviour in saves when the ruleset changes
- loading of savegames is not streaming but requires vast sums of memory (up to 100 megabytes)
- load of big games can be quite slow

New features we want:

- replay

So how would a future, better savegame format look like?

Also see Map format (work in progress)