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

[Thomas Larsen Wessel]

Thanks. I wiill keep an eye out for both those PRs; they seem promising :)

On Wed, Jul 24, 2024 at 1:33 AM Emma Hain <emma at north-road.com> wrote:

> 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
> [image: https://north-road.com]
> *North Road*
> Cartography • Development • Spatial Analysis
> ------------------------------
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