James,

> The snark in me suggests that if you were running the Solaris version
> of darktable, you could use DTrace to find out the function(s) which
> is/are taking the longest amount of time. ;-)

But I'm on GNU/Linux :)

> I still think it's worthwhile looking at the SQL that's being run
> when you mouseover. Even if the queries are returning null for tags,
> they might still be being constructed inefficiently.
> 
> I'd start by running darktable with  -d sql   and dumping that output
> to a file (it'll be *large*), and then seeing if you can narrow down
> the UI experience to a particular query.

Ok, will try that.

> There's also gprof, which might go some way towards helping the
> investigation as well.

I would like to avoid gprof if possible.

> Are you seeing this with a release version,or git master?

Yes on git master. I've not tested with latest release.

Pascal.

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

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