I have found that Darktable's performance depends far less on the overall
number of *images* in the database than on the lexical properties of the
*tags* in the database. I have one database with well over 50,000 images,
with which I notice no performance problems, and another database with
about 3,000 images, with which any operation involving tags is so slow as
to render Darktable nearly unusable.

The difference, so far as I have been able to determine, is that the images
in the smaller database each have a tag to identify the subject, resulting
in an image/tag relation with a different structure to the usual.

August Schwerdfeger

On Wed, Sep 21, 2016 at 1:46 PM, Frank J. <newslet...@fotodrachen.de> wrote:

> Am 21.09.2016 um 20:00 schrieb Pascal Obry:
> ..
> > Strange since some of us have far more than 50k images. It was even
> > reported by a user that he had 100k images IIRC.
> >
> > Maybe he reached an issue with the "old" mipmap cache?
> >
> > Not sure, but to me dt is fast for everything.
> >
> I have nearly 50K on my system.
> I've no problems with watchching or developing my photos.
> Export or creating thumbs is a bit slow because it's only an i3 with
> graphics on board, no GPU. A'm working to change this soon ..
> Slowest part, I think, is the tagging.
> Maybe I'm tagging too much: place, persons, event, ...
> For my old slide-scans I tag also film-type and camera-model, cause they
> have no exif-data.
> DT try to give my some intelligent suggestions while tagging.
> For example: when I tag (the german word for) "house-cleaning", DT
> suggests to tag also the name of my wife  ;-)
>   - really!
> DT trys to analyse "pairs of tagging". The database-table "tagxtag" has
> 2.2 Million entries for my 45K pictures.
> Typing in the tag-mask seems to freeze the programm. I have to wait many
> seconds.
> I would like to switch this feature off for faster work.
> --
> Frank
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