Moving a MC onEnterFrame

I’m at loss here.

We’re trying to make an endless banner that loops with dynamically loaded text. The text is embed and the anti aliasing is set for animation.

But the endless part isn’t the problem, thanks to a great tutorial on this site.

We’re basically telling the mc to move -1 on the x axis every frame.

 onClipEvent (enterFrame)
{
   _x+=-1;
   if (_x > 0) _x=-1040;
   if (_x < -1040) _x=0;
}

Yet, when we test it it stutters. It’s not moving smoothly. We’ve tried framerates from 10 to 120, but that didn’t solve it. But it did reduce the effect. We even tried to change the loading order under publish settings, but that didn’t do it either. We’ve also tried it on multiple computers with different specs. And we tried to use a timeline tween, but that gave the same result.

The framerate on 36fps gave us something that’s enjoyable for the eye, unless you focus on it. It’s still stuttering, especially when you watch it closely which will happen in the endproduct.

Now, I asked someone else and he also has encountered this some times. Is it that it’s just a shortcoming from Flash? Heh, but that wouldn’t make sense though right? Because when it isn’t moving horizontal it automatically looks a lot better.

Soooooo long story short.
How do I make a movieclip that’s moving from left to right on a stage move as smooth as butter?