We made a flash game with a big screen size(1000x600), and the terrain graphic will jitter while the screen scrolling(that's, camera moving with player) continuously.

What's the root cause? Or if you know how to eliminate this problem, please tell me. Any help is appreciated.

UPDATE:

The map's size is more bigger than screen, e.g 6000x1200. And the map has more than one layer, generally it has 3 layers. Terrain is composed by tiles. And FPS is 24.

If the FPS is set to 60, things will be better. But any way, it should work well at 24 FPS. I'm not sure if it is a natural problem of flash player, because some times a terrain object(e.g a house) look like a little bit distorted.