1280x720P playback is jerky on canvas preview

I have issue playback preview on Canvas window.
The video footage
uncompressed 1280x720 frames created by QT using "open image sequence" MOV. (the image sequence are pngs' )
My timeline setting is
1280x720 HDTV 720P (16:9)
Pixel Aspect Ratio Square
Field Dominance- NONE
QT Video Setting - PNG 100%
My MOV format is
Type - Clip
Creator - QT Player
Size - 1.3 GB
Vid Rate - 30fps
Frame Size - 1280x720
Compressor - PNG
Data Rate 41.2MB/sec
Pixel Aspect - Square
Field Dominance - NONE
Alpha - None/Ignore
When I try to playback the timeline, it will play, but it's very jerky. It doesn't play smooth.
I'm wondering if I'm missing some setting to have it play jerky?
I believe my machine is decent enough power to play HD footage.
Before this machine, I had G5, and I remember I didn't have the problem playing back HD in FCP.

Update,
Since PNG maybe the problem, so I created jpgs image sequence of exactly same scene.
Now, it did play smooth on FCP...
Which is good and bad.... we have been used jpg compression, but we swiched to png since it's lossless... and after all the question posted on this forum (I actually posted on Shake forum since more 3D people on the group), they recommended me for PNG.
http://discussions.apple.com/message.jspa?messageID=4674515#4674515
On top of that, I also tested myself of the playback-bility on QT.
When you "open image sequence" in QT, with PNG frames, it plays back smoother than JPG frames (PNG one is smooth but not totally smooth, jpgs is very jerky on playback in QT).
Simply I could just switch back to jpg, however, I'd like to use better compression for the end result animation quality...
Do you guys have any good suggestion?

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Premiere CS5 - Project Monitor playback is jerky after resintall of operating system and CS5

PROBLEM: Premiere CS5 - Project Monitor playback is jerky
This had NOT been an issue prior to reinstalling the operating system and all software. I have read numerous articles on the forums and have tried everything I can find...with no results.
STEPS TAKEN TO RESOLVE THE PROBLEM:
I have scoured the articles here http://www.adobe.com/cfusion/search/index.cfm?loc=en_us&term=choppy%20video&cat=support&pr oduct=premierepro and others at Cretive Cow
I have installed all updates for CS5 Master Collection, immediately following a fresh install of the operating system and SC5 Master Collection.
I have ensured that sequence settings match resolution and frame rates of footage - the problem persists.
I have tested by importing both standard def AVI files created from tape and high def SONY MP4 files - the problem persists.
I have ensured the latest Video drivers are installed (clean installation selected, so that the Windows default would be removed) - the problem persists.
I have tried the 3D settings in NVIDIA control panel | Program Settings tab... selected Adobe Premiere Pro from the drop down menu | and chaged 'Multi-display/mixed-GPU acceleration from the value of 'Multiple Display performance' to the value of 'single display performance'; although, I ran two monitors before using this latest NVIDIA video driver and I didn't experience this jerky footage issue - the problem persisted after affecting that change; so, I switched it back.
Since I have 96 GB of RAM, I don't use a pagefile. A zero MB page file is the same setting I had prior to rebuilding the C: Regardless of whether I have a pagefile or not, the problem persists.
I have tried creating a fresh user profile, where the user profile is created on the C: drive by default; and, where I left it there on C: to test for the jerky playback in a new PrPR project - the problem persists.
Regarding the C: (system drive) and why I reinstalled everything, it had become unstable and was locking up. I ran DISK ERROR CHECKING with the FIX parameter and the system was still locking up on me. Keep in mind that the System drive is a solid state drive. Anyhow, I had no choice but to dive in and reinstall everything. I wiped the system partition of the SSD using quick format and started installing the operating system. Now, I've read the CLAIM that this cuases performance issues; but, the only place I see issues is in the video monitor playback in PrPr. Everything else - Office applications...printing...browsing the Internet...works just fine, everything is responsive, whereas, I couldn't do ANYTHING with it before.
SYSTEM CONFIGURATION:
The Operating system and all software is installed on C:
All data files and most profile related folders are stored on D:
C:\ (one Intel Solid State Drive - SYSTEM DRIVE) Used Space: 57.5 GB Free Space: 388 GB
D:\ (four Western Digital 2TB drives in an on-board INTEL hardware RAID5 array & hotswapable backplane) used space: 1.28 TB Free space: 4.16TB
Adobe Premiere Pro CS5 VERSION: 5.0.3 (005 (MC: 218798))
Operating System    Microsoft Windows 7 Ultimate Version    6.1.7601 Service Pack 1 Build 7601
System Manufacturer    Intel Corporation
System Model    S5520SC
System Type    x64-based PC
Video    NVIDIA Quadro FX 4800 driver v.320.78
Display        Dell 27" LCD (DisplayPort)
Display        Dell 27" LCD (DisplayPort)
Processor    Intel(R) Xeon(R) CPU           X5680 @ 3.33GHz, 3326 Mhz, 6 Core(s), 12 Logical Processor(s)
Processor    Intel(R) Xeon(R) CPU           X5680 @ 3.33GHz, 3326 Mhz, 6 Core(s), 12 Logical Processor(s)
Installed Physical Memory (RAM)    96.0 GB
Page File Space    0 bytes
PREMIERE PRO CS5 SETTINGS:
Monitor PLAYBACK RESOLUTION: Full
Monitor PAUSE RESOLUTION: Full
(regardless of this setting, the problem persists)
PREFERENCES:
MEMORY:
Installed RAM: 95.9 GB
RAM reserved for other applications: 10 GB
Optimize rendering for: Performance
(Changing this setting to 'memory' does not resolve the problem)
MEDIA:
Media Cache Files
X - Save Media Cached files next to originals when possible
LOCATION: D:\Users...\AppData\Roaming\Adobe\Common
(User Profile folders were relocated to D:\ from within the properties of each folder's 'LOCATION' tab. This is the same configureation I had prior to rebuilding the C:\drive. Testing under a new profile where it's allowed to stay on teh system drive does NOT resolve the problem.)
Media Cache Database
LOCATION: D:\Users...\AppData\Roaming\Adobe\Common
PROJECT SETTINGS:
Scratch Disks
Path: D:\Users...\My Documents\
General
Video Rendering and Playback: Mercury Playback Engine GPU Acceleration
(Setting Viideo Rendering and Playback to 'Sofware' does not resolve the problem)
If any of y'all have any other suggestions, I'm all ears.
Thank you.

I'VE RESOLVED THE PROBLEM!
PREFACE:
OK, I am hoping that through this week-long Operating-System-and-Software-reinatalltion excerise of mine, I have revealed something that everyone -- whom have been cursing Adobe over -- can apply to their systems to resolve this jerky video problem within PremierePro CS5 (and quite possibly other versions, too).
If you've read my post above, you've seen all the steps I've taken to resolve the problem. I've read many posts, some of which have mentioned hardware upgrade / opitmization steps that one may take to enhance performance, and hopefully resolve the problem. I've read where people have taken these steps and have still experienced the problem...and then they curse Adobe. Fer-shame, fer-shame, fer-shame! (nod to Gomer Pyle).
In my case, I knew it wasn't an Adobe issue, as it had worked flawlessly before; and, it wouldn't require a hardware upgrade or reconfigureation, as my system is completely maxed out with two processors, a system drive and a hardware RAID5 array, a CUDA-suported nVIDIA 4800 FX card, and 96 GB of RAM. bla bla bla, puke...whatever. Bottom line is this:
It's not a software issue. It's not and Adobe issue; and Gawd no! It's NOT a PC vs. Mac issue! HA HA. The software had worked swimmingly well prior to the reinstallation / 'lobotomy' I perfomed on the system drive.
SOLUTION FOR ME:
Download and install the updated drivers for the motherboard. Mine is an Intel Workstation Board S5520SC. Intel has an INTEL DRIVER UPDATE UTILITY which automatically scaned my Intel system and identified drivers which needed updating. A very handy, time-saving tool!!! Here's the URL: http://www.intel.com/p/en_US/support/detect?iid=dc_iduu
The scan revealed two Intel drivers needing an update:
Intel Chipset
Wired Networking
and one non-intel driver:
Creative Labs Sound Blaster X-fi
I downloaded and installed these three drivers, rebooted, and tested PremierePro, and was extatic to find this resolved the problem.
If you have a motherboard from another manufacturer, then you may want to navigate over to their wibsite to locate chipset and other updated drivers for your motherboard.
ROOT CAUSE:
While Microsoft Windows 7 Ultimate was able to install certain default drivers during the Operating System installation (keeping in mind that this was done on an Intel Solid State Drive that I formatted using Quick Format) these default chipset drivers apparently weren't current and were ultimately the root cuase of the jerky video playback within PremierePro CS5.
Peace

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Hi Tom:
Thanks for your continued help and patience with this. Searching back in the archives, others are reporting the same thing, including the SAME data rate numbers that I am getting, There is something strange going on....
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I set my "Easy Setup" to be "DV-NTSC Anamorphic"
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Why is it not filling the "Canvas" like it is in the "Viewer"?
Also, these clips need to be rendered once brought into the timeline. It is already in DV format. Why does it need to be rendered?
PowerMac G5, dual 2.0 GHz Mac OS X (10.4.5) 2.5 GB RAM, oodles of hard drive space

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wolfgang schabhuettl wrote:
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My clips are from a Panasonic HC V700 camera filmed at 1080p 50fps
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Intel (R) Pentium (R) CPU P6200 @ 2.13GHz
Installed memory RAM 4GB
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Hildergard
Some thoughts...
If you video source for the project is 1080p50 (1920 x 1080 @ 50 progressive frames per second), then make sure that the project preset is set a
PAL
AVCHD
AVCHD1080p50
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ATR Premiere Elements Troubleshooting: PE11: Accuracy of Automatic Project Preset (New Project Dialog) Setting
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Please check out the above so that we can rule those factors in the matter that we seek to resolve.
Thanks for the follow ups.
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1280x720P playback is jerky on canvas preview

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