Stacking drag movie lagging when drag

just wonder if anyone know how to solve these problem.

i have load in a .swf and this .swf is make up of one drag object. When i load into my _level0, i can drag it but it seem then the drag is not smooth, instead it is lagging. Thus i went back to the indiviual files and try to drag on it and it was not lagging. …why is it like that? All the files are still on my local disk. Can’t imgaine what will happen if it is on the net. Please help! is this normal for drag object ?