After the recent update (0.1.1 update 1) alot of the game breaking stuff is gone but now, the list of customers and what they bought and how much they paid is bugged, It just says 0 copper on everything. and Iv made 3 new games and they run great until I start smelting tin. After loading a saved game that I recently reached tin smelting the frames dive down to mid 20s and iv seen the fps counter flash at 11 fps and I normally run smooth on highest settings. starting a new game makes it run great again.