imported jpeg sequence plays slow until once through

i have rather large image sequence (460 frames @ 24 fps, each jpeg 1024x400) i've imported flash—basically creating move clip in library has 1 frame in timeline each jpeg. when gets last frame of sequence, there actionscript loops (gotoandplay(24) - loop starts second animation).

i'm placing movieclip on stage in own layer, have large jpeg background behind on own layer, , i'm publishing mac projector.

on mac pro quad plays butter (no surprise there). when copy on powerbook 12-inch, closer target machine mac pro, plays , steppy first time through movie clip, once hits loop point plays smooth. identical mac pro.

so i'm assuming there's sort of memory caching or other going on here. there can have play though smoothly beginning? suggest bringing in embedded video rather jpegs in timeline? flv? should make compiled movie clip (can i?).

thanks in advance.

in case cares, found embedding flv of animation rather creating image sequence did trick. helps size performance (obvious guess).

one thing did notice couldn't seamless loop gotoandplay(specific frame); if have flv start , end in natural loop , let flash loop movie clip it's in, work seamlessly. include prior loop, had import separately , have play on timeline before loop movie clip.

and concludes useless forum thread ever....

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