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FlashMuller
Participating Frequently
December 12, 2018
Question

Poor performance of DNG-Files

  • December 12, 2018
  • 2 replies
  • 1794 views

Hey,

so I have this weird issue that Lightroom is basically unusable if - and only if - the used file format is DNG. Opening the Develop-Module approximately 15-20s in which the whole application freezes (Windows claims: App not responding), edits not visible for approximately 5-10s, changing the mouse position from somewhere in the ui over the image = freeze for 1s. Two things are weird: First of all the resources of my system are not used. CPU, GPU and Memory are still plenty avaiable. Second: This only happens for DNG files. I have edited some of the files using Photoshop and saved them back as PSD or Tiff - perfect performance in both applications. The said DNG files have not been a problem in Lightroom 6 - which I was using up to know. Files have been created externally (not Copy as DNG on import)

To get some things out of the way:
No Sync to Lightroom CC

No Face Recognition

No XMP

No Effect of Enabling / Disabling GPU

No Effect of using OnBoard or Dedicated GPU (Laptop)

No issues with other Formats

Technical:

Lightroom Classic-Version: 8.0 [ 1193777 ]

Core i5-8250U

8GB Ram

Drive: SSD

Screen: 1920 x 1080 - Color Calibrated using DisplayCal

Let me know if you need any further information.
Any ideas?
Thanks,

Daniel

    This topic has been closed for replies.

    2 replies

    GoldingD
    GoldingD
    Legend
    December 12, 2018

    When you created the DNG files, how did you do that? Were these created during import? Were they created later via Export? Were they created outside of Lightroom via Adobe DNG converter\?Or perhaps a third party RAW converter?

    All these have various settings that can effect DNG file size, Are the original RAW files embedded in the DNG file (Makes them Huge)? Is a preview image (JPEG???) embedded in the DNG file (usually not a big deal), Compressed?

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    FlashMullerAuthor
    Participating Frequently
    December 13, 2018

    The Camera is Fujifilm X-T2. But I use Iridient Transformer before importing to Lightroom to convert the RAF-Files to DNGs.

    I can't really post the DNGs as they are from a corporate portrait session and we have the GDPR..

    Anyway, I just reimported them to a new Catalog and the behaviour is as expected, the performance good.

    EDIT: At least it was at first. After having used the catalog for several minutes it dropped back to the previous state.

    F
    FlashMullerAuthor
    Participating Frequently
    December 13, 2018

    Addition: File Size is somewhere around 60MB each. Catalog is at 20MB.

    Todd Shaner
    Todd Shaner
    Legend
    December 12, 2018

    FlashMuller  wrote

    The said DNG files have not been a problem in Lightroom 6 - which I was using up to now. Files have been created externally (not Copy as DNG on import)

    Did this start immediately after upgrading from LR 6 to LR 8.0? If so try the suggestions at the below link.

    https://www.lightroomqueen.com/standard-lightroom-troubleshooting-steps/

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    FlashMullerAuthor
    Participating Frequently
    December 12, 2018

    I went through the list (except for reinstall, which I might (have to) try tonight), no effect.

    One thing I realized: When selecting a TIF-File the load on the CPU is as I would expect: A short spike and then back to idle, 3 Seconds max. Opening a DNG-File the system will go to something between 30 and 50% with spikes up to 70% for minutes before returning to idle. Making a single change will start it all over. A rendering issue?

    F
    FlashMullerAuthor
    Participating Frequently
    December 12, 2018

    One thing to add which will void my previous guess of a rendering issue: Exporting DNG-Files takes way longer than TIF as well. Seems to be somehow format related.

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