Playback Issues With FCP 7

Hi all
I am having playback issues(jittery) since i had it, I am using FCP 7, I installed mountain Lion reinstalled FCP, upgraded the memory to 14 GB, hoping this would help, The specs are below, are there any know issues with the HD, Graphics card or memory?
any suggestions I really appreciate
Thanks
But i am at my wits end,

Are your timeline playback settings set to Dynamic?
Is your audio playback set to Low (faster)?
What are the properties of you source material?
What are the sequence settings you are using?
MtD

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codec not found. You may be using a compression type without the corresponding hardware card.
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Jon Chappell has a guide for this on his Digital Rebellion blog...it actually advises using QT 7.1.6 for your version of FCP
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Yeah I had that thought as well but no joy. It works for the player but it doesn't solve my plugin problem. It really seems to be something about prioritizing, the way the audio cuts in and out - notice how it takes a few fractions of a second before a process loses its CPU cycles when you click away from it? You can observe this with System Monitor on the Mac or Linux or process explorer on XP. That's how the audio is cutting out and back in. I still think it's probably a bug/'feature' either with Gecko, the Firefox browser engine, or with the QT plugin..

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Hi Jim,
Thnaks for your feedback.
Here is a link to download some footage : WeTransfer
But you know, I done some test this morning. If I put my footage on my SSD system or on my NAS with RAID 5, no trouble with playback.
But if I let my footage on my Raid 1 Media volume (mirroring), the problem still be here... I think it could be the disk speed... What do u think about that ?

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