Scrolling in timeline goes pixelated

Hello,
Whenever i watch i youutbe video people scroll through the timeline without having the picture to render.
What happens for me is. I scroll through my video and the picture get's picelated and I see it loading the frame.
Is this hardware sided or can I do something inside the software?
Specs:
AMD Fx-4300 3.8GHZ
8GB Ram-1600MHZ
ATI HD 6450 If i'm corect.
BTW:
What are good memory and multiprocessing setting for me?
I have no information about my HDD's
I will research if needed.
Manuel

As Rick says, you can turn off Adaptive Resolution if you want. Details about preview modes are here:
http://helpx.adobe.com/after-effects/using/previewing.html#id_66718

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