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Library Preview Rendering Slow

Update:11-30Source: network consolidation
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I'm sure I'm missing something here and am hoping someone can point me in the right direction. I just purchased lightroom 2.3 primarily as a workflow tool for the RAW photos I take at sports events. The first step in my process is to review all the photos and remove the ones with poor composition and ones that are out of focus so that I don't spend time cleaning them up before I do any cropping.
My problem is that the rendering of the preview thumbnails seems to take an inordinate amount of time before I can see the thumbnail in enough quality to make a decision on the focus quality. I opted to invest the time up front and generate 1:1 previews during the import process. I've got the thumbnails sized to display two thumbnails with the sidepanels hidden to use as much realestate as possible. However, when I move from thumbnail row to thumbnail row, at least one of the thumbnails is initially displayed in a blurry format and takes approximately 2 - 4 seconds to display in it's final state.
Considering I have 353 photos to review, I'm looking at sitting 17 minutes total just waiting on the final rendering of thumbnails to decide on whether they're in focus or not. This just doesn't seem right if I selected to pre-generate 1:1 previews. So I've got to have something set wrong somewhere. Any ideas or direction would be greatly appreciated!
Dale

The Best Answer

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Thanks all for your thoughts and ideas. It looks like I'll just have to live with the multiple pass slow rendering in Lightroom if I want to continue to use it. I ran a test with the same batch of photos in Capture One LE, the product I intended to replace with Lightroom. Once the folder and photos were imported into Capture One and thumbs rendered for the first time, moving from one large size representation of a photo to the next (there's no "library" module, it looks more like the LR Develop module and all work is done from there) took significantly less time than in Lightroom (less than 1 second).
Some other notes from the comments above:
- yes, I was using very large thumbnails to scan through the 300+ photos and filter out the bad ones and yes it requires me to do a lot more scrolling. Annoying, but necessary for me. One of the more difficult things for me to do is determine if a shot was in focus or not. This decision requires a large thumbnail for my old eyes ;-)
- I have 100Gb free on my catalog drive and 200Gb free on my data drive. I can't imagine Lightroom would require any more to render thumbnails and display photos in the develop module more quickly.
Thanks again everyone!
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