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?
AMD Fx-4300 3.8GHZ
ATI HD 6450 If i'm corect.
What are good memory and multiprocessing setting for me?
I have no information about my HDD's
I will research if needed.
It's called adaptive resolution. You set it in the preferences. It's just the way AE works. I'd suggest you go through the getting started materials on the home page of this forum. I used to give a link but I think you'll do better if you look for it yourself.
As Rick says, you can turn off Adaptive Resolution if you want. Details about preview modes are here: