8 ms·

Yea, CSS animations are insanely CPU heavy. CodePen has to kill them after 5 seconds to keep the site responsive.

• malandrew 14y ago
  AFAIK a CSS3 3D transform of 0,0,0 with preserve 3d should push the work to the GPU.
• html5web 14y ago
  Main page of codepen.io uses JS code to kill animations after 3-5 secs. When you click on single codepens it opens without JS animation killing restrictions.