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

[Bauer.Josef at swm.de]

Thank you very much for the idea. This is also a very interesting approach we will consider.

Kind regards,
Josef

Von: QGIS-Developer <qgis-developer-bounces at lists.osgeo.org> Im Auftrag von Bo Victor Thomsen
Gesendet: Mittwoch, 25. September 2019 08:55
An: qgis-developer at lists.osgeo.org
Betreff: Re: [QGIS-Developer] Performance issues while loading a big QGIS project


That's a bloody huge project...

I can't fathom you need all these layers at once.

You could try to split the project in a "base" project with a minimum set of layers and split the rest in of the layers/groups  into a number of qlr files.

And use the "QLR Browser" plugin to load/unload the different qlr files as you need them.

I personally think this method is better than using other plugins with similar functionality and certainly is better than loading 1080 layers at once.

The QLR browser plugin is used in a number of Danish municipalities which typically uses a very large number of layers in their daily use of QGIS.

--

Med venlig hilsen / Kind regards



Bo Victor Thomsen
Den 23-09-2019 kl. 16:34 skrev Bauer.Josef at swm.de<mailto:Bauer.Josef at swm.de>:
Dear QGIS developers,

we are facing some crucial performance issues while loading a big QGIS project.

The project ...
... has 1080 layers
... has 167 layer groups
... is heavily styled (in fact, most of the information in the .qgs file are stylings)
... has a size of 53 MB (the .gqs file)
... loads the data from a PostGIS database

The main problem we are facing is, that the loading time of the .qgs file is between 10 and 15 Minutes (depending on the network traffic).
We don't need all the layers which are defined in the .qgs file immediately. In most cases, we just need a bunch of those layers at once.

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.

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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