Desktop mac Safari 7 elements flicker while animating height

So, im getting this annoying problem, and here is the case: I have 4 divs with fixed position atop of each other, one with 100% height and width, but the other 3 are height = 0, because im using the scroll position to give them the height of the screen to cause a kind of filter effect. Im using jQuery .height() to add height value.

Everything ok so far, it works in IE9,10, Firefox & Chrome (both mac and windows), Windows safari, but when i test on my macbook (Mavericks) with safari 7 the div element flickers up and down (background, text elements, images and so on) when i start to scroll and get the height effect.

Check it out: http://www.vauhaus.com.br/teste/

Please, help me, im cracking my head on this problem :/

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