Reached Act 4 again but that fucking city is already getting on my nerves. Runs like shit, the fights are annoying, most quests are just "Talk to X then go and talk to Y" and the map is just horrible.
Step 1: Navigate to \Users\UserName\AppData\LocalLow\Owlcat Games\Pathfinder Wrath of The Righteous
Step 2: Delete everything except the settings json, saved games, portraits, and screenshots (while your game is closed)
The logs such as the combat log in this game will just keep stacking up infinitely. Same with items left on the ground, they just keep stacking up save file size and slowing the game down. Deleting these fixes that, just make sure there isn't any valuable items that you haven't looted (items you haven't discovered will be fine.) This brought the act 4 city from 20 fps to around 50 for me on my 7 year old pc. Hopefully they improve the performance more in the future but it's a fix for now.