[Action Script] Lag in simple animation May,2012

I have a simple loading screen that I show by using mc.visible=true;

Inside this movieclip is a simple timeline animation that shows 6 very small pngs in sequence. PNG1 is shown for 5 frames, then PNG2 and so on...

I have a couple loading processes happening in the background... When I set the loading movieclip to visible=true, the animation freezes on frame 1 for Approx 3 seconds.

When I use a profiler my framerate stays at 60fps without a dip.

Is there a more lightweight way to do this to avoid the lag ?
Lag in simple animation

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