Visual Studio 2026 with Qt Visual Studio Tools 3.5.0 extension very very slow
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Hi,
I have a big solution with multiple Qt 6 projects and it takes a very very long time to open, close and build with the lastest version of Qt Visual Studio Tools 3.5.0 on Visual Studio 2026 (18.4.2). It takes more than 10 minutes to open or close the solution. The build process stucks multiple time for multiple minutes without output. Disabling the plugin seems to improve the situation.
Important thing to consider : If I open the same solution with Visual Studio 2022 (17.14.29) and Qt Visual Studio Tools 3.5.0, everything is working as it should. What's more, everything was working perfectly in Visual Studio 2026 just a few weeks ago. This is likely related to the latest versions of the plugin and/or Visual Studio.
Does anyone have a solution, because it’s unusable under these conditions?
Best regards,
Jonathan -
C Christian Ehrlicher moved this topic from General and Desktop
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Hi,
After conducting numerous tests lasting several hours, I noticed that disabling the following two options significantly improves performance: "IntelliSense - Auto project tracking" and "IntelliSense - Run Qt tools in background build". However, there are still times during the build when Qt seems to completely freeze the process for a few minutes, but at least build starts immediately.
I was able to reproduce the issue with a single (big) project, but it's ncessary to have several moc files.
I'm surprised no one else is having the same problem?Best regards
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Hi,
You should open an issue on the bug tracker.
As for nobody else getting hit by that, Visual Studio 2026 is not even 6 months old. Lots of people do not switch to the latest versions of such tools without reasons especially when these are just released.
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Hi. thank you.
I created a ticket : https://qt-project.atlassian.net/browse/QTVSADDINBUG-1344
