[Qgis-user] what setting effect topological editing performance?

[Richard Greenwood]

Adam,

Thanks for your suggestions. I added the layer to the slow project and it's
still slow. The project, and the layers in it, are generally responsive and
there's no especially complex styling. The issue is only when editing,
specifically editing nodes, with topological editing enabled, on PostGIS
layers (not memory layers or shapefiles).

 I also tried with a new, clean profile and it's still slow.

The PostGIS server is running on an AWS EC2 instance via an ssh tunnel. I'm
traveling and I went from a fairly fast internet to a slower one and the
slow project went from slow to very slow. So I guess that's a clue.

It's not a big deal, obviously I can recreate the project. I was mainly
curious since I have not run into this in other projects and I thought that
maybe I was overlooking something.

Rich


On Sun, Apr 9, 2023 at 6:03 AM Adam Nielsen via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> > I have an old project that is painful to edit with topological editing
> > activated. I put a couple of the layers into a new project and
> topological
> > editing is very quick. Specifically, in the old project, moving a single
> > node on a polygon with the vertex tool that does not require any
> additional
> > vertices to be moved takes about 2 minutes to complete but is nearly
> > instantaneous in the new project.
>
> What happens if you add the layer again to your existing project,
> following the exact same procedure as when you added it to the new
> project? (i.e. adding the PostGIS connection again from scratch).
>
> If that's fast then it would point to either an issue with the
> PostGIS connection or something to do with layer style.
>
> You could also try using the layer right-click menu to copy the styles
> from the old slow project to the new fast one to see if that also slows
> down the new project.  I wouldn't have thought it would be the styles
> causing the slowdown because although a re-rendering happens when
> editing the features, it also happens when dragging the map which you
> haven't said is slow, but it can't hurt to rule it out.
>
> Is it only slow when editing the features, or is it also slow when you
> first open the project and it's loading the list of features from the
> DB?  That could also hint at an issue with the DB connection.
>
> These are only guesses, but perhaps they might help narrow down the
> cause of the slowness.
>
> Cheers,
> Adam.
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-- 
Richard W. Greenwood
www.greenwoodmap.com
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