[Development] Qt Compilation Speed

[Marc Mutz]

Hi,

The Qt Creator folks have noted that compilation of Qt projects against Qt 6.2 is sometimes almost twice as slow as it was in 5.15: https://bugreports.qt.io/browse/QTBUG-97601

While we have some ideas where this may come from (including more std headers, qmetatype compile-time typename construction, qglobal.h becoming larger and larger), most of these should be fixed by PCH, yet PCH builds are also slower.

The questions that we face now are a) do we care and b) if we do, then what metrics should we use to define success?

Thanks,
Marc

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