The first Save after opening a project can take minutes

[bkepl]

What is the bug or the crash?

The first time I save an opened project, it can take several minutes, longer than opening the project. This occurs whether I save immediately after opening or after a few edits. Following saves take a few seconds.

Steps to reproduce the issue

No particular steps need to be taken to reproduce this behavior.

Versions

QGIS version 3.30.3-'s-Hertogenbosch QGIS code revision 2411cec1 Qt version 5.15.3 Python version 3.9.5 GDAL/OGR version 3.7.0 PROJ version 9.2.0 EPSG Registry database version v10.082 (2023-02-06) GEOS version 3.11.2-CAPI-1.17.2 SQLite version 3.41.1 PDAL version 2.5.3 PostgreSQL client version unknown SpatiaLite version 5.0.1 QWT version 6.1.6 QScintilla2 version 2.13.1 OS version Windows 10 Version 2009

Active Python plugins db_manager 0.1.20 grassprovider 2.12.99 MetaSearch 0.3.6 processing 2.12.99

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

This bug appeared somewhere between 3.20 and 3.28. I opened an old project with more than two dozen layers in the oldest version I have installed (3.20) and the first save took a few seconds. I opened the same project in the next version I have installed and the first save took between three and four minutes. I reopened the project in 3.20 and as before, the first save was a few seconds. Thinking this may have been caused by a plugin, created a profile with no plugins. The aforementioned behaviors were unchanged.

Shortly after my tests I installed the 3.32 release candidate. As with nearly all releases, general behavior of the program seemed smoother, but the issue of the long first-time save persists. It may be a little faster, but the difference is negligible.