As mentioned by MatuTheMan in "Performance issue in Darkest Dungeon since Adrenaline 22.7.X", the following issues have been found, caused by AMD's drivers for 5 months now:
Note: Under AMD's Gaming settings, I have attempted the default settings, and I have set it to resort to the application's settings strictly to no luck.
Update: I made a new game, tried that and it didn't work. However, after some time and an update, I was able to get more than 7 fps, but 20 isn't much better. I then had two errors, one in video form and the other in the picture
Noteworthy note: it would seem the most common way to break the game is opening inventory with a character sheet pulled up while in the embark menu. Happens also in town at a lower frequency.
Same thing happens to me, although I remain with constant 30fps while in the Estate, and while campaigning, it jumps around 20-50. I have an RX 6600 XT. It's very sad this is still happening after many updates from the driver. Hope AMD fixes it!