could you share a raw + xmp file that take so long to export? also more details on your machine would be good. cpu/gpu and so on.
I just tried this briefly and in a VM, but it seem I can confirm that TIFF exports are extra slow.
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I am a very happy user of Darktable for Windows (Win 7, 24 GB RAM, i7 3770), but I have run into an annoying difference with the Linux version that I use as well.
I have a large collection of DNGās (pre 2013) from my old D80, imported back then into Lightroom. Now, Darktable on Linux has no issue to open them, but on Windows I get frequent skulls and glitched images in my lighttable and am unable to open most of the files because āfailed to read camera white balance information from ā¦ā.
Any idea what might be going on? Is this just me? The behavior occurs even with the recent 2.4.0 build.
Hereās a sample picture that does not load, if anyone wants to test: DSC_0143.dng (7.9 MB) (CC0)
Please let me know if I need to supply more information! Many thanks for any replies 
Thanatomanic itās not just the windows build. The same issue here unfortunately in Linux build 2.4.0rc0+6~g7a91f41c6 using your sample image.
Oh, ehm, my Linux version is 2.2.5 and I have no issues there. So, some regression happening?
Iāve just tested and the original 2.3.0 Windows version has the same problem.
I tried on my Windows 10 pro computer, i5/8 gb memory) which is fairly old, I had no delay in converting to tiffs. Seemed to take about 2 seconds no matter how many bits 8-16-32 didnāt seem to be a problem. DT was quite rapid in the conversion. My camera is a Canon 7d, so not huge raw files.
@darix Sure, the raw files are fuji RAF which are quite large, I have linked to a google drive folder that has the raw and xmp. My PC details are AMD A6 -5400K APU with Radeon HD Graphics 3.60hz, 8gb RAM and is 64 bit windows 10.
https://drive.google.com/open?id=1IGfFP_eLsjjSid_BXTwmJcteW04dfVal
Cheers Jason
I downloaded your file, did some minor edits, and had no problem saving it as a 16 bit tiff. Took about 3 seconds.
I donāt know if Iāve read all your posts, but wondered have you tried a delete, reinstall of DT?
@rd52 I had not completely uninstalled previously. I have just done so and deleted anything I could find Darktable related and reinstalled. The results are the same, I am a bit suspicious of my HDD though, I am going to try the laptop and see how that goes
Edit - tried the laptop with exactly the same results, it also is a HP
Cheers
Jason
@JStain Also jumping in. What about your HDDs are you suspicious about? I suppose you could do install an app that divulges some of the drivesā metadata to see if they have enough wear and tear to warrant replacing. Hard drive failure is not enjoyable!
Itās a known regression in rawspeed that is being worked on: Regression: huffmantable is broken. Ā· Issue #100 Ā· darktable-org/rawspeed Ā· GitHub
Until that is fixed you better stay with 2.2.5. And for the future, donāt convert raw files to DNG, that causes problems eventually.
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Thanks for the reply, good to know itās being worked on! I couldnāt find a meaningful issue in the tracker.
And yes, I have seen the error of my ways a few years back and donāt convert to DNG any longer.
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It might help if you could add such a file to raw.pixls.us with a CC0 license. That way we will know when itās being fixed and if it ever breaks again when running automated tests.
Just some things that are starting to happen a bit, like the system locking up, disk running at 100% for unknown reasons. I did run a disk test utility but it timed out because it was taking so long
While OpenCL speeds up darktable noticeably even on a laptop with only the integrated Intelās GPU, it became unavailable after a Win10 update, that included the graphic driver. Installing the latest driver from Intelās website made it work again. Just in case ā¦
My integrated Intel HD4600 doesnāt get used by dt. It is used by Capture One or DxO Optics Pro. Iām on Win 8.1, with the last version of Intel drivers for that GPU.
On my computer, a W10/ i5/ 64/ 8 GB memory, with a NVidia Geforce 620. When I check the OpenCL option in preferences DT is noticeably slower. Is there any way to speed it up short of a new video card? The NVidia cardās drivers are current. Does anyone have a hint?
Please run the OpenCL test:
"c:\Program Files\darktable\bin\darktable-cltest.exe"
And share the output of that.
Seems the same for me, Dell XPS 15 with integrated Intel HD630 and Nvidia Geforce GTX 1050. Hereās the output from the cltest:cltest.txt (53.2 KB)
Also, I noticed a bug regarding preview view.
If I watch an image in preview mode (pressing Z) after I have worked on it, the preview got some problems: the image is blurred, or the colors are inaccurate. Otherwise, freshly imported files are visualized in the right way. Any way I can help in that?