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When playing an extended game there are some issues with saves:

1. Save (.data) begins to exceed 1 gigabyte for a save (huge galaxy, around turn 600)
2. Saving the game causes the game to freeze until it's done writing - the UI does not give good feedback.
3. When 'save' is clicked, UI should change the text to 'Saving' and disable the button until the save is completed.