Laggy HTML

I have a problem with HTML5, CSS3 and CasparCG.

When i open my HTML page in de browser, my page renders good. When i try it in Caspar, my page is laggy.

It seems like a framerate problem.

Does someone had this problem, and how did you fixed it?

Can you post a short video?

Could you be more specific on what kind of content you are trying to animate and the method of the animation timings (CSS-based or JavaScript-based)?