The villagers were like smoking or something generating a ton of particles was very had to look at as it was runing at such low frame rate..
Had same problem, its about buying the amusement park, once you buy it, game is unplayable on web version it just leak until unplayable, if you refresh the game, you get back with 0 buildings but all the gold you had and can ascend again and spend points, if i dont buy the amusement park it works well but as said before once i buy it the smoke that edove mentioned start leaking until it totaly freezes.