Okay, thank you for letting me know and making such a great game, I am currently within the game there is a galactic civil war that with primarly lv11.75 empires. I find that in the broswer version at least, after the year 3000, and lv 10 empires that the game starts randomly crashing.
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HOLY hell I've never simulated it that long myself. But yeah I've also had problems with the web version in that performance degrades until it crashes. Web just sucks as a platform for games especially with Godot and there might not be much I can do about that. I suggest playing the downloadable version. If you get crashes there too then that might be concerning and I'd have to check for memory leaks and what not.