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

[Bo Victor Thomsen]

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:
>
> 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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