Why does enabling hardware-acceleration in CSS3 slow down performance?

Question

I am moving 6000 small div elements in an css3 experiment using a transition from top: 0 to top: 145px to test performance.

Using n

Answer 1

Check chrome://flags in chrome. It says

"When threaded compositing is enabled, accelerated CSS animations run on the compositing thread. However, there may be performance gains running with accelerated CSS animations, even without the compositor thread."