Very high execution times in QGIS 3.34.0 for models created with the Graphic Modeler

[news24lor]

What is the bug or the crash?

I have been using the new version of QGIS 3.34.0 for a few days and have found that in running models created by the Graphic Modeler, there is very different performance between version 3.32.3 and 3.34.0. I have several models created with the modeler including a very complex one with about 100 algorithms that until version 3.32.3 was executed in about 11 minutes, while with version 3.34.0 the same model after more than 3 hours was executed ONLY 18% of the total!!!

In the case of simpler models with very few algorithms the execution times are similar with increasingly better times with version 3.32.3.

I checked and rechecked everything but not much can be done. When "Run" is pressed to execute the model, before the first script appears in the log, several minutes pass while in the previous version 3.32.3 the first model script was executed after a few seconds.

I checked the performance without plugins installed but the result is the same

QGIS 3.32.3 worked well

Steps to reproduce the issue

Go to... Processing Toolbox Open Existing Model ... You have to open a big Model

Versions

QGIS version 3.34.0-Prizren QGIS code revision b77936ec947 Qt version 5.15.2 Python version 3.9.5 GDAL/OGR version 3.3.2 PROJ version 8.1.1 EPSG Registry database version v10.028 (2021-07-07) GEOS version 3.9.1-CAPI-1.14.2 SQLite version 3.35.2 PDAL version 2.3.0 PostgreSQL client version unknown SpatiaLite version 5.0.1 QWT version 6.1.6 QScintilla2 version 2.11.5 OS version macOS 13.6

Same problem in QGIS 3.34.0 for Windows

Supported QGIS version

• [X] I'm running a supported QGIS version according to the roadmap.

New profile

• [X] I tried with a new QGIS profile

Additional context

I checked the performance without plugins installed but the result is the same. I have tested this problem on Windows and Mac version. The problem is only in QGIS 3.34.0

[agiudiceandrea]

@news24lor, thanks for reporting. I think it would be useful, in order to help a developer find the root cause of the issue, if you could provide the model, the input layer(s) and parameters.

[BTreeTech]

I am having similar issues, I don't think it is model specific as it happens with all of models that I use day to day, but could be a specific algorithm. QGIS version 3.34.5-Prizren QGIS code revision 4b308492 Qt version 5.15.3 Python version 3.9.18 GDAL/OGR version 3.8.4 PROJ version 9.3.1 EPSG Registry database version v10.098 (2023-11-24) GEOS version 3.12.1-CAPI-1.18.1

[nyalldawson]

Tagging this as needing feedback. Without a sample model there's nothing we can do

[news24lor]

Hi, in the last version 3.36.x, the speed is comeback as 3.32.x. I use Qgis with Intel and ARM processor and now the graphic modeler is reusable. In the ARM processor the difference of execution of a big model is huge respect to Qgis on Intel. For me is resolved! Thank so much!

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[github-actions[bot]]

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