[Qgis-user] QGIS data source speed profiling

[Charles Dixon-Paver]

You can use the F12 key to access the developer tools which have a panel
for recording and monitoring network requests, as well as timing certain
operations for debug purposes.

One other trick I thought of to try was to use the label expression
epoch($now) on both a remote and local layer to show the time that an
expression is evaluated per layer which should give some indication of how
quickly a layer is available to QGIS. I then added a canvas decoration with
the same expression and every time I panned I could get the difference in
milliseconds between the layers. This actually kind of worked to my
surprise. Although not ideal it certainly should give you some sort of
feedback on vector layers and identify some of the slower layers.

Some of the members of the development list may have more sophisticated
methods available so I've copied that list into the response.

Regards

On Fri, 23 Jul 2021 at 15:59, Hugh Kelley <hghklly at gmail.com> wrote:

> Hi all,
>
> I have a number of qgis files with a layers pulling datasets from a
> variety of sources that include local and shared drive files, shp, gpkg,
> tiff, and a few more, postgres databases and web feature services and map
> tile services.
>
> I'm wondering if anyone has any recommended workflows or tools for
> understanding the time required to refresh these layers. Some are faster
> than others and I have suspicions but I'd like to be able to see actual
> data confirming what I think are the slower layers.
>
> It's complicated by the fact that some symbologies take longer to render
> than others and that for non-local data sources, the connection speeds may
> change.
>
> Thanks for any suggestions. happy friday!
>
>
> Hugh
>
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