CS4: Why do I have Lag on only 1920 1080 video play back??

Hi,
I currently record with a Sanyo Xacti HD2000, at 1920x1080 30fps SHQ resolution. Whenever I play the clips on the camera or Nero Essential 8 on my computer there is no lag problems. However the moment I upload a clip onto Premiere Pro CS4 with this resolution I have severe lag on the play back from the Premiere video screen. I've recorded on 1280x 720 and 640x480 on the camera too and the play back is completley fine with no lag what so ever, just the moment Full HD clips are imported do I get any lag. I don't think it's because my computer can't handle it either as it has in it Core 2 Duo processor, 3GB of Ram and an Overclocked 1GB Geforce 8600 GTS Graphics Card. The only thing I'm not sure about is what Presets I should be using for my footage as this might be the problem.
If ANYONE can help I'd seriously appreciate it, you can email me a [email protected] If you want to further questions about anything you may feel may help you guys helping me or just to communicate to me faster;
Thank you sooo much!!!

Hi,
I dont think the gpu of your graphics overclocked card is used at all in the cs4 environment...thats more for gaming stuff.
so you can rule that out as a "plus"
The 3 gig ram is kinda anemic...low power...every gig helps...so 4 would be better...think about it...the OS alone uses a lot of ram..
the power requirements that adobe says you need to run the program is on the low end of requirements...and you are maxing things out playing with real high HD stuff.
everything else is a question of how you set up your hard drives and raid array and so on to deal with editing in general ( there are hardware threads about how to set that up best....scratch disk and so on...cache...)
plus you might have a red bar above your timeline indicating it should be "rendered" for smoother playback...and that has an effect too.

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CS4: Why do I have Lag on only 1920 1080 video play back??

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