Watch Dogs - How to improve the performance and frame rate
У вашего броузера проблема в совместимости с HTML5
Optimizing Watch Dogs performance overall, removing stuttering and massive frame rate drops during certain sequences of the game and 20+ fps increase. A title bar appears when windowed is activated which cannot be shown in the video. The trade-off is small for a better and smooth gameplay.
How the game looks when windowed:
http://imgur.com/9M5PrrD
If you dislike the title bar and dont want to see it you may remove it by going in the game options menu-display- and set Windowed mode to "Borderless". But by doing so youll sacrifice some frame rate.