[Qgis-user] Diagnosing QGIS slowdown (Windows)

[Nicolas Cadieux]

Hi,

What is your cpu, gpu, memory amount. Do you have a hard drive spinning on another task like antivirus, Windows indexing... update windows and drivers.  If you look at the task manager, try to see if one core in 100% busy.  You may have a rogue task is overtaking the computer even if total cpu is low.

Could this be the geopackage fault?  Somebody had a problem this week with increasingly slow geopackage performance...

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 déc. 2020 à 07:49, Martin Pergler <pergler at gmail.com> a écrit :
> 
> Happy user of QGIS since about 3.2. Currently using 3.16.1 (OSGeo4W install)
> and experiencing pretty severe performance degradation. I know these things
> are a bear to hunt down; would appreciate any suggestions how to go about
> finding the cause of the problem.
> 
> Symptoms:
> - Mild sluggishness rendering canvas with editing turned off, as well as
> general UI operations (e.g. tooltips on layers in layer list sometimes first
> appear as a black box, and only 1/2s later fill with the actual tooltip)
> - Mild sluggishness digitizing new lines or vertex-editing new ones
> - Significant slowdown in attribute form for new features digitized (2-3s
> response time to type in a text field, for instance)
> - When attribute form closed, prior features in layer being edited sometimes
> fail to be rendered on canvas (the new one just added is)
> - 10-15s freeze (blue circle mouse icon) after exiting edit mode. Edits are
> saved properly.
> 
> Things worked just fine on the same project until last month, when I took a
> break from GIS tasks. In between, I both upgraded 3.16.0 -> .1, as well as a
> new Windows OS update installed itself, and some new device drivers. So
> plenty of things to blame.
> 
> I have already:
> 
> 1. Uninstalled and reinstalled OSGeo4W completely
> 
> 2. Tried with a new, no-plugin user profile (sluggishness persists, though a
> bit better - so I suspect some low-level slowdown which struggles with
> anything additional, but is not directly caused by something in my profile)
> 
> 3. Checked I have all layers indexed, no crazy validation rules, etc. BTW
> all my layers are in a gpkg (or raster TIFFs) on a local drive (and besides
> it worked before).
> 
> 4. Monitored hardware performance. I have adequate hardware for QGIS. CPU
> usage stays ~30%, GPU ~20%, temperatures reasonable, RAM usage reasonable.
> 
> 5. Tried disabling the Browser panel (given some recent bug reports on
> Browser and network drives). No effect.
> 
> Thanks for any sleuthing suggestions!
> 
> 
> 
> 
> --
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