As said I do not know. There has been many many changes between the demo and v1.2. I think the only way for me to fix it is if I can reproduce it myself. You said the game runs too fast, which doesn't make much sense to me as there are both options to enable vsync (which should sync to your monitor refresh rate at the vary least), and to lock the frame rate to 60 fps, and both are on per default now.
If you press F1 in game you will get a debug overlay that will show information about FPS, UPS (updates per second), RAM usage etc. Perhaps you can try to get it to show. FPS and UPS should be 60 normally.