Well, IMO the "slow speed of development" here is relative. Compared to other (total conversion) mods it might be slow, but if taking in account that Imperatrix: Victoria doesn't stop with modding existing game mechanics, but heavily relies on creating entirely new ones (only look at the trade modul) it is a actucally a quite steady pace in my perception.
Without wanting to imply in any way that is only good as a "filler" (it is a masterpiece on its own!) Imperator Invictus is th perfect way to have fun with IR currently
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