Many people in the same boat. The 'fix' is to lower textures in the settings but it didn't help for me.

same

same for me, my save won't launch today, but did work yesterday.
However, I can launch a new game.
I assume it is caused by yesterday's update, but i'd like to finish my game (several hundreds of hours game).
How can I do ?

over and over and over again

the mod is literally unplayable because of this, and you can tell it's the mod's fault because this doesn't happen in native or any other mod i've played.

Having this issue too. At first its fine, even big battles work fine, but as time goes on, the game just seems to become more and more brittle. By the time the invasion comes, I'm happy to finish a single battle without crashing.

It's a real shame, because Perisno is really, really good imo. I used to champion PoP as the best wb mod, but I think Perisno might be better content-wise. Its just the runtime crashes keeping it from taking that spot.