I'm using a 256x256 graphic in a Tiled Background on a 720x1280 game. It has a Bullet behavior to make it scroll down, and a check to reset its position to make the illusion of an infinite scroll.
It's as simple as can be, but it's choppy even on my PC, not to mention mobile. On the PC, it's smooth for the first few seconds, but then the chop settles in. On mobile, it's choppy right from the start.
The frame rate is great (60 on PC, 55-60 on mobile), CPU use is minimal, and WebGL is active on both. I can't think of any reason that it's not smooth as silk.
I've played with all the graphic project options (sampling, scaling, etc), but none of them has any effect. It's still chop, chop, chop.
An example is attached. Does anyone have any idea what's going on?