Slow loading of QGIS Project

Question

I have a number of standard projects set up for QGIS users. Some of them take more than 5 minutes to load. Things recently got much worse suddenly - and I want to track down why.
Are there any methods to check what stages of loading a project are slowing things down or/and how long QGIS is taking over each stage of loading a project?
In my particular case the issue may be related to internal network overload, and seems to be related to upgrades (at the same time) from Windows 7 to Windows 10 and QGIS 2.18 to QGIS 3.4. However, I think answers will be more useful for others/Stackexchange if they consider the wider question.

Donald Singh · Answer

I had issues with slow loading of QGIS in a general sense. What helped me was the unchecking my installed plugins so that they don't load on startup. This helped independent of what version I was using.

Answered by Donald Singh on September 30, 2021

programmer1234567 · Answer

One idea is to load it without rendering and check the load time. Then turn rendering on and try different layers one by one.
Also check for feature counting on layers as that can slows thing down.

Paula · Answer

Deleting complex print layouts really helped to reduce the loading time of my QGIS projects.

saturnine · Answer

In my case I opened a fairly large QGIS 2.6 project in QGIS 3.16 and it took an extremely long time to load, almost an hour. In 2.6 the same project file takes a minute or so to load on the same Windows 7 machine.
I isolated the problem to an 81000 row CSV layer. The CSV file used newlines for the row delimiters, and QGIS 3 apparently needs cr-lf delimiters (at least on Windows). This caused it to treat the entire file as a single massive row.
After I saved the CSV file from Wordpad (which converted the delimiters to cr-lf), the load time in QGIS 3 was normal.

Slow loading of QGIS Project

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