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it could be because
1. your system is taxed and unable to handle the demands of your swf or
2. your frame rate is too low
and yes, you can probably fix both but if it's the first issue, how you do that depends on everything that your swf is doing when you see the problem.
I use a Mac Pro, 2 x 3.2 GHz Quad-Core Intel Xeon with 8gb DDR2 RAM, so I don't think it's the computer...
And my framerate is set to 24fps, and that should really be enough... It not lag as usual. It's almost as if the timeline sometimes jums a frame back or something. The shape jumps back and forth some pixels... I tried to adjust my fps to a really high level, but the flickering is still there.
I found a temporary solution. Instead of using classic tweening, use the new, fancy one! Then it won't flicker as much.