Lightroom slow, drawing thumbnails

I'm using a new 24 inch iMac, with 4 gig ram. When I open a folder of any size (say, over 40 pictures, it take a looooong time for Lightroom to create thumbnail images, for review. I have preferences set to medium jpegs. For some reason, I expected this process to be pretty much instantaneous.

Hi Jacob,
i already investigated this problem very closely. The problem you describe is caused by LR1.2 sometimes when the meta-data part of a picture is extended. Some of those pics are currently causing the preview and quick-view function of leopard to crash. Just try to quick-view (press space bar in finder)such a picture and you will see finder crash.
One other effects is, that the creation of thumbnail pics in a folder stops after the thumbnail process gets to the picture with the problem causing all following pics to have no thumbnails.
I already tried this pic on other platforms without any problems. This leads me to the conclusion that Apple has to to fix the problem. A bug report was filed by me to apple two days ago and I got the response an hour ago that they combined my bug report with an already known issue they are currently working on.
Bottom line
It looks like Adobe (Print module bug) and Apple have homework to do to get LR1.2 running smoothly on Leopard. If this is done we will enjoy thumbnails in finder for jpg and raw files
Just give the guys at Apple and Adobe some more time. I am very confident that they are working with very high priority on these problems

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