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[fahrenhyde]

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How much memory do you have?

 

I was surprised how much quicker the iMac works after expanding its RAM to 16 GB, the maximum available for this particular computer.

 

I've never understood why LR sometimes displays placeholders (as you show) instead of the actual images, but in my case the frequency of that behavior seems to have decreased with the memory expansion.

 

Another thought: Are you using fast cards for all the cameras?

 

You've got a stumper here, Jorma. :-(

 

In another thread http://www.l-camera-forum.com/topic/256481-lightroom-11-previews-rendering-duration/ I brought up this issue, and got an answer from user "menos / M6"

 

Quote:

Regarding the preview thumbnails during the import into Lightroom - this is an OS specific issue, where the OS built you are using has not yet been upgraded to the latest raw file definition by Apple for the camera these files have been produced with (Leica S 007). You have to wait on Apple (not Adobe, not Leica) to upgrade those raw file definitions via the OS update function through the App Store.

I had this very same issue when Apple took a felt aeon until they finally updated the raw file definitions so we were able to see preview thumbnails from Leica MM files back then.

It may take a while until that happens as I doubt that the latest Leica S is much of a priority camera Apple will update for as was the first gen MM back then :-(

(Quote finished)

 

As for memory, I have 16GB installed. And I use very fast cards (though this shouldnt have anything to do with the rendering).

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[CheshireCat]

In another thread http://www.l-camera-forum.com/topic/256481-lightroom-11-previews-rendering-duration/ I brought up this issue, and got an answer from user "menos / M6"

Quote:

Regarding the preview thumbnails during the import into Lightroom - this is an OS specific issue, where the OS built you are using has not yet been upgraded to the latest raw file definition by Apple for the camera these files have been produced with (Leica S 007). You have to wait on Apple (not Adobe, not Leica) to upgrade those raw file definitions via the OS update function through the App Store.

 

You need Mac OS X to support a given raw file in order to display the preview in the Finder, however I think Lightroom uses its own code to display thumbnails in the app.

[ho_co]

Also, I sometimes get a screen full of those file-unknown icons from the same card that on other occasions works properly. And that despite the fact that all my cameras' files are supported by Lightroom: For me, it's an intermittent issue that luckily hasn't recurred recently. No idea why or why not.

[adan]

For the brief time I used an M240, I noticed that Adobe products (in my case, Camera Raw and Adobe Bridge) took longer to handle compressed DNGs than uncompressed - even crashed trying to display or save them on rare occasions.

 

Which is a bit weird, in that, since the DNG format is an Adobe creation, Adobe products always compress the DNGs once they have been worked on, anyway. But it may be that Leica's compression is different than Adobe's compression, and is a bit harder for Adobe software to read.

 

One thing I never do - ever - ever - is work with files while they are still on the SD cards. As CheshireCat mentioned on page 1, I drag/copy the "Leica 100" folder to my desktop, eject the card, and only then move the copied folder to my filing system and open it with Bridge to see the pictures.

[CheshireCat]

For the brief time I used an M240, I noticed that Adobe products (in my case, Camera Raw and Adobe Bridge) took longer to handle compressed DNGs than uncompressed - even crashed trying to display or save them on rare occasions.

 

Which is a bit weird, in that, since the DNG format is an Adobe creation, Adobe products always compress the DNGs once they have been worked on, anyway. But it may be that Leica's compression is different than Adobe's compression, and is a bit harder for Adobe software to read.

 

 

A possible explanation for the crashes is that, due to firmware bugs, Leica's DNG files are not fully compliant to the standard.

This of course is no excuse for a crashing application, but certainly it is for not-so-smooth operation.

 

Compression adds some computations when the file needs to be displayed, but modern systems should be able to handle it without a significant delay.

I have never had such problems with Lightroom on Mac, and I always shoot compressed DNG. I don't use Camera Raw, and when I need Photoshop, I export to TIFF from Lightroom.