1080p (from a 7d) jerkiness

I'm just doing my first premiere project for 10 years: (so I'm more than a bist rusty!)
I captured in 1080 25p. I've setup to edit in 720p. because:
1) I dont need 1080p
2) to allow me to pan around the frame if I need to (which I'm not doing a huge amount).
I wasn't expecting playback to be realtime but its pretty gnarly. Footage plays fine in source window, but even un-resized fottage is playing back about 5fps or less (like its almost unusable).
If I render then it plays back fine, but rendering a 2 minute clip takes about 10 mins. Oy!
its cs4, win7 64, i7 920, gtx275 with latest driver, 12gb ram. Hardrive is single wd raptor.
Am I just expecting too much?
Is there a better way of working? (like would I be better working at 1080p and re-sizing at the end?)
thanks

Hardrive is single wd raptor.
This statement put us on the wrong foot. 4 green disks in raid10, plus a SSD boot disk in addition to the WD Raptor is a different story.
Jerkiness can be caused by background services or processes, Check this out: Windows 7 Service Configurations by Black Viper
and use Process Explorer to see how many processes are running. If more than 50, there are a number you can easily kill. Ideally you will have around 40 or less processes running. Of course you have indexing and compression turned off on all your drives, disabled the sidebar, use the latest video driver, etc. All the usual steps to nelp improve performance.

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