Thumbnails scrolling very jerky

Hi all
When I scroll through my events screen or scroll through the thumbnails within an event it is intially very jerky and laggy. Only when I've scrolled all the way to the bottom and then scroll back up again does it become smooth. It almost seems like iPhoto is loading the thumbnails from scratch as they appear on screen for the first time, but this happens every time I start iPhoto - shouldn't these cache somewhere so that the scrolling is smooth from the outset?
Is this normal behaviour for iPhoto or do you think there is something wrong with my setup? Coupled with the fact that my iPhoto is uploading to Flickr in a completely random order (which I have started another thread about in here) I am starting to wonder if there's something wrong with my install and am considering uninstalling and reinstalling it. Any other advice first?
Thanks
Steve

I've uploaded a screencast of how it looks to me on YouTube here. Can somebody view it and comment on whether it's jerkier than theirs? Perhaps iOS has just spoiled me, I don't know, but I've never seen iPhoto '11 on any other Mac so have nothing to compare it to.

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