Does cacheAsBitmap helps for performance of shape tweens?

i have image converted movieclip (background) , have mask movieclip (bgmask) set mask image movieclip this:

background.cacheasbitmap = true;

bgmask.cacheasbitmap =  true;

background.mask = bgmask;

 

in bgmask have few linear gradient shapes animate shape tweens using keyframes.

if don't set cacheasbitmap both, nothing happen since need alpha masking , work then. in scenario cacheasbitmap working me or agains me? (not have choice).

 

still try replace of shape tweens movieclips solid shape in them , move them around uncover part of background, , want smoother transition stick shape tweens. ?

 

if object i've set cacheasbitmap true no longer being animated moved sized , on, better set cacheasbitmap false?

 

and if have same case previous object being moved example when stage resized it's not redrawn, better set cacheasbitmap=false ?

 

also question. have complicated photoshop design using 3-4 blending modes final result. if use in flash performance getting terrible since it's affecting on screen. there way optimize case somehow?

 

thanks.

enabling cacheasbitmap object undergoing x,y changes performance benefit.  object undergoing every other visual change, enabling cacheasbitmap detriment.

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