[Qgis-user] Speed up loading a project, by postponing fetching WFS features

[Emma Hain]

Hey All
I believe these may go some way towards helping the issue - the first one
is planned to go ahead this year
https://github.com/qgis/QGIS-Enhancement-Proposals/issues/261
https://github.com/qgis/QGIS/pull/53069

Cheers
Em

On Tue, 23 Jul 2024 at 12:55, Stewart Holt via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> I have for years noticed the same thing. I also have about 30 WMS and WMTS
> layers which are mostly USGS National Map product layers and a few ESRI.
> When QGIS starts, I see in the status bar, each layer that is loaded. It
> rips through my shapefiles and then takes quite a bit of time to "load" the
> WMS/WMTS layers. Only about 2 of these layers are checkmarked to be
> displayed at any given time. QGIS apparently does some initialization on
> these layers, even if they are not to be initially displayed. While it is
> valuable to get a full check of the availability of layers on startup, it
> would be much faster to either lazy initialize these as needed or to spread
> it out over my 24 cores to do it in parallel. Occasionally some or all of
> the layers are not available for periods of time. When this happens, it
> really takes a long time to startup. I have set the network timeout from
> the default (1 minute?) to 15 seconds to make that situation less painful.
> I think the delay is caused by the time it takes for the WMS service to
> respond, not processing time. My internet connection is 1 Gbps.
>
> I think one of the best solutions would be to load the network based
> layers marked to be displayed, then make the map canvas available for use
> and either continue to load the remaining layers in the background or lazy
> initialize them as needed. I wonder how many others face this situation and
> if there would be sufficient interest to submit a request for an
> enhancement.
>
> Thanks,
>
> Stewart Holt
> Georgia Appalachian Trail Club GIS
>
>
> On Fri, Jul 19, 2024 at 5:04 AM Thomas Larsen Wessel via QGIS-User <
> qgis-user at lists.osgeo.org> wrote:
>
>> I have a project with roughly 30 WFS layers. Most of the layers are
>> disabled by default, and I rarely have more than 10 of those layers enabled
>> in any session.
>>
>> But as far as I can tell, it loads all data from all WFS layers, no
>> matter if the layers are enabled or not. Am I right?
>>
>> Does this happen in sequence or in parallel?
>>
>> It takes 100 seconds from clicking open, until the GUI updates to show
>> the loaded project (for the above mentioned project with 30 WFS layers). I
>> believe the Internet connection is the bottleneck. Often I'm on a cell
>> phone connection, and the load time is much worse.
>>
>> Is there anything I can do to make it not load all WFS data right away?
>> Eg not load features from any disabled layer, until I actually need it?
>>
>> Sincerely, Thomas
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-- 
Emma Hain — Product Manager/Senior GIS Analyst
emma at north-road.com
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