Noob Question: Jittery animation

Dear Edge experts,

The very basic animation on the index page of my site

http://www.ludwignobel.com/

looks jittery on firefox and IE10. IE10 is good when I check ActiveX-Filtering.

The animation is imported into muse as a .oam file. The sliding jpg of the billard balls which is jittery was created with no keyframes, just easing out (elastic).

I am new to this, so any help would be appreciated.

Thanks

Ludwig