Usually this problem is connected with high screen resolution (e.g. 2560x.... , 1920x....). Some graphical effects may overflow RAM or even throttle game process.
In this case we recommend to lower game resolution until freezes are gone. There is no exact resolution when the game runs smoothly. It depends on your PC.
Change your high resolution (2560 x 1440/ 1920 x 1080 ) to 1024 x 768, choose a windowed mode and run the game. Set your resolution back (to 2560 x 1440 or what you had before) and choose Full screen.
We are working hard to improve game engine and apologize for the inconvenience.