Hello,
This is a Dell laptop with Intel® Core™2 Duo CPU P9400 @ 2.40GHz × 2.
It is indeed a rather old computer, I must admit.
The thing that puzzles me is that, on that same computer, I have been using
another photo software that was
behaving quite opposite to DT : very slow when importing photos into library,
but very fast when exporting them
to JPEGs, at a point I could export both 85% and 100% in a few seconds per
photo.
Given the speed DT imports pictures at, I had expected it would export very
fast too.
About the high-resources-consuming modules, you may be right but (I'll check
this further as I am not quite
sure) it seems that (some ?) pictures with only demosaicing, basecurve, HL &
Shadows and Lens correction took
more than twice the time of others with WB, demosaicing, basecurve, HL &
sahdows, exposure, local contrst,
tonecurve, monochrom, profiled NR & lens correction - respectively ~20 and ~45
seconds.
I ended up exporting 345 pictures (and not 256), and it took over 2 hours and
40 minutes to achieve.
I'll do the test you suggest then come back and report. Or just wait for 2.0 to
be released !
Regards,
J.-Luc
> Message du 19/10/15 23:58
> De : "Pedro Côrte-Real"
> A : "Jean-Luc CECCOLI"
> Copie à : "darktable-users"
> Objet : Re: [Darktable-users] DT very slow at export pictures
>
> On Mon, Oct 19, 2015 at 9:50 PM, Jean-Luc CECCOLI
> wrote:
> > All is in the subject : 20 sec. to export a 100% jpeg, I find it rather
> > slow.
> >
> > 1.6.9 on core 2 with 8 GB ram and usb 3 running 14.04 LTS. Will take 85 mn
> > to export 256 jpegs !
>
> You probably have a relatively slow cpu and have activated expensive
> modules like profiled denoise. Not much else you can do to fix that.
> If you want you can launch darktable from a terminal with "-d perf"
> and see what's taking longest.
>
> Cheers,
>
> Pedro
>
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