[Qgis-user] Snapping tools really slow

Julien Cabieces julien.cabieces at oslandia.com
Thu Jan 21 21:31:36 PST 2021


I made quick tests with some dataset and I failed to see any performance

Could you create an issue with some data sample and project?

Is it the index building that take a long time (there is a progress bar
displayed at the bottom of the map close to the mouse coordinate information
while index is currently building) or is it when you move your cursor on the map that the
snaping information takes time to appear. Or is it when you pan the map?

You can enable snapping for specific range of scale, avoiding building
index at very large scale where snapping is useless.


> Hi,
> I've been using version 3.10 and 3.16 and I notice that enabling snapping is extremely slow and oddly significantly slower on 3.16 than 3.10. We thought it might be downloading the dataset on screen but discovered the data is back from the database within seconds and the delay is because QGIS is building an index.
> Why is it so inefficient and is there anything that can be done to get better performance?
> It is really slow and we are trying to transfer users from MapInfo / ESRI so they will not like the performance at the moment.
> To be clear the data has a primary key, spatial indices and all is of good quality. As I say the data downloads and displays within seconds on the map; is it because I've selected snapping to segment as well as vertex?
> Thanks,
> Paul Wittle
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> Dorset Council
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