Sounds like a low memory situation. Try increesing your swap file size 
and Lightroom, (I think Lightroom uses a separate scratch file), scratch 
file size.

Igor Roshchin wrote:
> Time to time I experience the problem that it takes extremely long
> time to render the image in Lightroom, i.e. I see the typical "JPEG-ish"
> squares, both in the fit-on-screen size and when zoomed-in.
> Then, if I adjust some parameters (e.g. sharpening), the picture
> appears normally, but then, if I pan it or zoom in/out, it again
> shows that rugged images (I guess it is the small JPEG preview stored
> in the RAW file).
> This can happen even on the files that were just recently imported,
> so that the full-size previews should be available.
>
> I did "relaunch and optimize".
> Sometimes it helps, sometime it doesn't.
> Usually it goes away after 2-10 minutes since the LR was started.
> Does anybody observe it? Any ideas how to deal with it?
>
> Thanks,
>
> Igor
>
>
>   


-- 
Remember, it’s pillage then burn.


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