[QGIS-Developer] Performance issues while loading a big QGIS project

Régis Haubourg regis.haubourg at gmail.com
Tue Sep 24 10:22:18 PDT 2019


Thanks for your feedback.
Bye!

Le mar. 24 sept. 2019 à 18:09, <Bauer.Josef at swm.de> a écrit :

> Hello Nyall, hello Régis,
>
>
>
> thank you for your hints. The option “Trust project when data source has
> no metadata” improved the loading time a lot. The project still needs about
> 6 minutes to load, but at least it is already an improvement. However, I
> guess, that is normal for such a large project. The plug-in “Layers menu
> from project” also looks very interesting.
>
>
>
> Kind regards,
>
> Josef
>
>
>
> *Von:* Régis Haubourg <regis.haubourg at gmail.com>
> *Gesendet:* Dienstag, 24. September 2019 08:30
> *An:* Nyall Dawson <nyall.dawson at gmail.com>
> *Cc:* Bauer.Josef extern IT-DS-TS <Bauer.Josef at swm.de>; QGIS Developers
> List <qgis-developer at lists.osgeo.org>
> *Betreff:* Re: [QGIS-Developer] Performance issues while loading a big
> QGIS project
>
>
>
> Agreed, this should speed up the loading time of layers without metadata
> (probably postgresql views mainly in your case)
>
>
>
> If your need is to access some layers only, I recommend the
> menu_layers_from_project plugin. It will only parse the xml but not load
> the data until you choose to import some layers into a session.
>
>
>
> I also experienced that lowering the network timeout can speed up ogc
> webservice layers when the service is not responding.
>
> Regards
>
> Régis
>
>
>
> Le mar. 24 sept. 2019 à 00:49, Nyall Dawson <nyall.dawson at gmail.com> a
> écrit :
>
> On Tue, 24 Sep 2019 at 00:41, <Bauer.Josef at swm.de> wrote:
>
> >
> > Therefore, the question is, if QGIS provides a mechanism to postpone the
> initial loading of all layers from QGIS startup to the point in time when
> we actually need the layers? I.e., the layer structure is loaded but not
> the layer data.
>
> There's no such existing mechanism.
>
> Have you experiment with the setting under project properties -- data
> sources -- "Trust project when data source has no metadata"? I believe
> that was added to assist with cases like this.
>
> Nyall
>
> >
> >
> >
> > Is there a build-in QGIS mechanism that allows loading only the needed
> layers from the .qgs file and write the appropriate styles to it or is it
> planned to implement such a mechanism in QGIS?
> >
> >
> >
> > Kind regards,
> >
> > Josef
> >
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