I've just finished porting my application from Qt 5.15 to 6.5, and I'm finding that compilation is significantly slower now - builds take twice as long or more. For example a linux-g++ build of a project with ~650 .o files has gone from 45 seconds to 100. I see similar increases on Windows with MSVC2022, and in other projects with more compilation units.

I'm already using precompiled headers, including a bunch of Qt headers and some STL.

The next MSVC2022 preview release has a "Build Insights" feature which shows time spent processing header files, and my biggest culprits are some headers of mine that use a lot of Q_GADGET and Q_PROPERTY macros.

Does anyone have any suggestions on how to speed things up? I see some other comments about this online for example https://forum.qt.io/topic/142309/compilation-times-with-qt6/12



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