Spritesheet animations sometimes not finishing

[mraak]

It happens sometimes that not all the frames get rendered in a very simple 5 frame sprite sheet animation. It happens on desktop browsers usually first time the game is loaded. It's happening on a cheaper Android Chrome tablet all the time, which leads me to believe it might be a performance related issue. Any ideas?

[mraak]

I wasn't specifying the frame rate, now they're finishing but it's still strange, maybe I found a bug.

 

lid.animations.add("close", _.range(0, 5), 15);