Darkest Dungeon 2 very low fps

I've installed DD2 (Epic Store version) via Heroic and played it fine before, but when I tried today after the Kingdoms update I'm getting very low fps - more like fpm - I've tried GE Proton 9-23, Wine-ge-8-26, lutris-ge-proton-8-26 and Proton Experimental and there was no difference.
I have no idea of what to try next - any suggestion?
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