Color has suddenly got very sluggish

Hello, i've just finished grading a project shot on RED camera in ProRes 422 HQ and even when I applied heavy grades to shots it still ran in real time, very smoothly.
Recently I've shot just a little project on a small AVCHD camera in ProRes 422 LT 1080i and sent to Color, it's very, very sluggish, bordering on un-usable!
I'm on an iMac with 2GB RAM and this has only happened since updating with the new Pro Apps update and 10.5.3 update. I'm working with the latest FCS3 and working out of a FiewWire 800 external hard drive.
Does any body have any help on why its suddenly gone sluggish? Has this been in discussion recently since the updates?
Cheers

I'd expect that a very highly compressed LongGOP format like AVCHD cross-formatted may give you more grief than even a high resolution format like ProResHQ. LT is still regarded as an "off-line" codec that is going to require a very large amount of decompressing before its usable by an app like COLOR.
That's what I'd suspect at first, but this is a low-end format that I don't deal with very often, if at all.
jPo

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