It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

×
If you are having this issue with NVidia cards, then disable full screen.

I couldn't play the game for 5 minutes without freezing but now I am 2 hours into the game with zero issues.
seems to be happening in windowed now as well.