I just checked mine and it takes about 1 sec to load the zoom image and the same when I move around within the zoom. My computer has 3 gig of ram and a 2.2 ghz processor. I don't know what settings I have on the thumbnails but I don't think they are set to a high memory/disck usage value. Sorry I can't offer more help. As an aside, our camera club had a guest speaker at the last meeting, a gent fromthe Canon Explorers of Light program. He was demoing Lightroom and was having a very hard time getting the program to do what he was trying to show. He was using a Mac laptop and got several queries concerning the "slowness" of Lightroom sometimes. I have only experienced slowness when importing raws and when I make a contact sheet. It takes a while to render 30 raw images at a time. Overall, I am very happy with the program and am attempting to learn it more day by day.
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