Fullscreen perfomance VS. window mode

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hello,

i working on flash application(as3) , have faced bizarre issue. while works in window mode fine(performance wise) in fullscreen mode it's much slower.

my application designed work in 1024x768 fullscreen mode. when switching it(on 1024x768 display) it's slow. when viewing in window of same size considerably faster.
application doesn't deal sort of complex graphics, performs quite lot of calculations , displays few vector object, few bitmaps applied filter , move them around(it sort of presentation).

hence question. latest flash player use directdraw output graphics? there way make fullscreen mode faster?

maybe 1 @ least point on description of flash's internal rendering mechanism?
i'd love @ least understand why freaking slow in full screen?


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