Target gpu on the device you're testing .. you'll get much better results.
You can do it on the xml configuration file on <renderMode> or if you're publishing in flash on the settings of renderMode select GPU.
Also get rid as much as you can from vector graphics and use bitmaps instead.
You can use Adobe's method of converting a vector in bitmap like this : myMC.cacheAsBitmap = true;
And also if you're moving an object, scaling or changing it's transparency use myMC.cacheAsBitmapMatrix = new Matrix();
These are some basic optimization tips.