AS3 as slow as AS2?

ok, i've made a simple comparison test (due to a performance
issue i had with a more complex app). the app adds 10000 movieclips
to stage, each of them with a random color and random alpha. i've
done this in as2 and as3 (as2 compiled in flash authoring, as3
compiled with mxmlc). the result is kind of freaking me out ;)
AS2 build time: ca. 6s
AS3 build time ca. 1s
so far so good. but then, i resize the window so i can see
all the rects, then i just do nothing. nothing! i just leave the
window open:
AS2 cpu: 99%
AS3 cpu:
99%
so.. well.. WHY??? i of course can see flash handling 10000
timelines.. some timers perhaps.. but i've also tries with shapes,
and it's still going to 50%, that just doesn't feel right. i've
published to 120fps, less improves.
anybody has an idea? i hate when things take cpu where
nothing happens.

I of course tried that too: cacheAsBitmap has no improving
influence at all. Even when I leave those MovieClips or Shapes
empty, it's still eating way too much cpu imho. Okay, there
are 10000 objects to loop through with each frame cycle, but
it must be a condition like if (mc.changed) ... at least that's how
you'd expect it to work.
I've just done some more testing. The cpu heavily depends on
the mouse pointer position - if it's within the boundary containing
any DisplayObject, it eats a lot more cpu. This doesn't depend on
wether the mouse is moving or not. So my guess is that Flash Player
checks on each frame cycle wether the mouse is within the stage
boundaries, if yes it checks the mouse against all DisplayObjects,
to find out wether it shall dispatch any mouse events. Okay, that
makes more sense. I still think that this could be improved though:
First of all it should only check on mouse movement OR whenever
some kind of render flag set to true, second it could make checking
dependent on wether there are any event listeners that need
checking.
Well, at least I think I've more clue now about what's
actually happening. I still think that this could be improved very
much. I've created a little test html page, where I try to do the
same, 10000 objects, same size, same position. When I test with
browsers, cpu load depends very much on mouse MOVEMENT, meaning
that when I hover the mouse over the area and I don't move it, cpu
load is very low. When I move the mouse though, it starts eating
cpu (50% on safari, 20% on FF).

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_root
SWFBridge (AS3) connected: host
SWFBridge (AS2) connected as client
imgNum: 10
thumb: images/image1.jpg
image: images/image1.jpg
thumb: thumbs/image2.jpg
image: images/image2.jpg
thumb: thumbs/image3.jpg
image: images/image3.jpg
thumb: thumbs/image4.jpg
image: images/image4.jpg
thumb: thumbs/image5.jpg
image: images/image5.jpg
thumb: thumbs/image6.jpg
image: images/image6.jpg
thumb: thumbs/image7.jpg
image: images/image7.jpg
thumb: thumbs/image8.jpg
image: images/image8.jpg
thumb: thumbs/image9.jpg
image: images/image9.jpg
thumb: thumbs/image10.jpg
image: images/image10.jpg
4
_root
4
163
_root
163
67
_root
67
43
_root
43
56
_root
56
20
_root
20
85
_root
85
64
_root
64
3
_root
3
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