Whats the correct way to cacheasbitmap when animating on the timeline

after finish animations find every keyframe has instance field blank have fill in instance named @ beginning of animation.
is normal? when state instance cacheasbitmap caching every new keyframe since thinks theres new instance ocurring? or cache once , use each keyframe following, animations include static image moving around screen in classic tweens.

 

also should using graphic symbols instead of movieclips? 100+ things need cached? hear graphic symbols more efficient movieclips dont know anyother way cacheasbitmap graphic symbol, wont let me assign instance name.s there other nuances or details im missing or doing wrong when using feature? have imence amount of vector art being cached @ beginning of level , far runs okay less perfect. want make art more efficien

if start object in keyframe, assign instance name , add more keyframes in frames greater initial keyframe, same instance name maintained.

 

if you're doing else, instance names lost and, in fact, objects same , have same instance name considered different objects flash.

 

also, not apply cacheasbitmap movieclip changes frames because each keyframe (whether movieclip's bitmap changes or not) generate bitmap.

 

even in apps mobiles can otherewise beneficially apply cacheasbitmap , cacheasbitmapmatrix, may not benefiicial movieclips change frames.

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